Infrared Thermography as a Tool for Assessing Animal Welfare and Its Usefulness in Veterinary Research

A special issue of Animals (ISSN 2076-2615). This special issue belongs to the section "Veterinary Clinical Studies".

Deadline for manuscript submissions: closed (18 March 2024) | Viewed by 31469

Special Issue Editor


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Guest Editor
Neurophysiology, Behavior and Animal Welfare Assessment, DPAA, Universidad Autónoma Metropolitana, Xochimilco Campus, Mexico City 04960, Mexico
Interests: animal welfare; thermoregulation
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Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Infrared Thermography as a Tool for Assessing Animal Welfare and its Usefulness in Veterinary Research”, was conceived to gather and publish leading research papers on advances in infrared thermography (IRT), thermal imaging processes, and related methods that foment the use of thermal images to evaluate modifications of temperature in domestic or wild animals (poikilothermic and homeothermic populations) as they deal with such environmental challenges such as cold, heat, pain, fear, hunger, anxiety, and boredom, natural processes such as illness, growth, aging, weight gain or loss, exercise, courtship, mating, agonistic behavior, suckling, imprinting, stages of physiological development (estrus, pregnancy, parturition, lactation, etc.), and other factors can that modify or interfere with thermal equilibrium.

IRT systems have proven useful in assessing the thermal status of animals by measuring the radiation emitted from a body that is subjected to changes in superficial microcirculation, which can increase or decrease these emissions. In addition, the IRT technique has the potential to be an effective screening method for clinical research to detect local inflammatory processes, wounds, neoplasms, pain, emotions and neuropathies. Indeed, in animal science and veterinary medicine, thermography has several benefits for animals in terms of evaluating lesions, diseases, and surgical procedures. Applications in veterinary medical science focus on its use as a general diagnostic tool in areas such as oncology, orthopedics, reconstructive surgeries, and rehabilitation. Furthermore, this can be utilized effectively to assess the impact of climate change, heat stress, physiological and behavioral responses associated with external and internal factors, and their interactions in many kinds of animals: farm, companion, laboratory, and wild.

I invite and encourage researchers in these fields to submit original or review manuscripts that address one or more of these diverse topics in these key fields of research. Suggestions include, but are not limited to:

  • Diagnostic use of infrared thermography in animals that are experiencing pain;
  • The advantages of IRT for the assessment of the thermal status of zoo animals;
  • The role of IRT in studies of wild or domestic animals (poikilotherms and homeotherms);
  • Climate change and its varied impacts on farm and wild animals;
  • Importance and advantages of using IRT to evaluate adaptive behavioral and physiological responses of animals during transport, mating, pregnancy, parturition, lactation, weaning, growth and development, and death (including stunning and euthanasia);
  • Clinical Importance of IRT for assessing the health status of wild animals under human care;
  • IRT as a method for clinical research to detect local inflammatory processes;
  • Evaluation of IRT as a non-invasive method for measuring autonomic nervous responses;
  • Potential applications of IRT in the human–animal relationship (HAR);
  • Insights into the use of IRT with birds and mammals;
  • Applications of IRT in veterinary medical science;
  • Latest news on the use of thermography in sport science and veterinary medicine;
  • Effects of heat stress on animal reproduction;
  • Infrared thermal imaging and the emotions and behaviors of animals;
  • Clinical usefulness of infrared thermography to detect sick animals;
  • Applications of IRT in poikilothermic populations;
  • Heat stress in homeothermic populations;
  • IRT as a tool for assessing animal health and welfare;
  • Importance of IRT for identifying reproductive disorders;
  • IRT in relation to heat loss or gain in hot and cold environments;
  • Efficacy and function of feathers, hair, fur, coats, and skin in thermoregulation strategies;
  • Usefulness of IRT to assess behavioral and physiological mechanisms of thermoregulation in nonhuman mammals (central and peripheral vasomotor control);
  • Neurophysiological mechanisms of vasomotor responses and thermogenesis;
  • Advances in the use of IRT within relation to farm animal production (milk, meat, eggs);
  • IRT and the assessment of the health and thermostability of laboratory animals;
  • Recent advances in thermal imaging technology in animal science.

Please receive my best wishes. I look forward to receiving your proposals.

Dr. Daniel Mota-Rojas
Guest Editor

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Keywords

  • IRT imaging technology
  • infrared imaging
  • thermal imaging
  • pain assessment
  • climate change
  • zoo animals
  • inflammatory processes
  • heat stress and thermoregulation
  • surgery, anesthesiology
  • emotional responses
  • behavioral thermoregulation
  • immunosuppression
  • neoplasia
  • neuropathies
  • infectious neonatal diseases
  • thermoregulatory capacity
  • behavioral and physiological responses
  • reproductive disorders
  • diagnosing disease
  • burn patients
  • estrus identification
  • diagnosing pregnancy

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Published Papers (17 papers)

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18 pages, 2856 KiB  
Article
The Relationship between the Infrared Eye Temperature of Beef Cattle and Associated Biological Responses at High Environmental Temperatures
by Musadiq Idris, Megan Sullivan, John B. Gaughan and Clive J. C. Phillips
Animals 2024, 14(19), 2898; https://doi.org/10.3390/ani14192898 - 8 Oct 2024
Abstract
Cattle in regions with high ambient temperatures are at risk of heat stress. Early detection is important to allow action to be taken to minimise the risks to cattle exposed to thermal stress. This study aimed to investigate the impact of heat stress [...] Read more.
Cattle in regions with high ambient temperatures are at risk of heat stress. Early detection is important to allow action to be taken to minimise the risks to cattle exposed to thermal stress. This study aimed to investigate the impact of heat stress on IRT-Eye temperature and its association with the behavioural and physiological responses of heat-stressed Angus steers (n = 24) on finisher and or substituted diets. Overall, 2 cohorts of 12 Angus steers were individually housed in a climate-controlled facility to examine responses to heat stress when fed on a standard finisher diet, based on a high percentage of cereal grains, and on a substituted diet in which 8% of the grains were replaced by an isoenergetic amount of lucerne hay. Exposing feedlot cattle to hot environmental conditions increased IRT-Eye temperature, which had a strong association with behaviour and physiology. There was no evidence of differences between the different dietary cohorts. The cattle with increased IRT-Eye temperature showed stress-related responses, including a downward-facing head, ears directed backwards, and other indicators of heat stress such as increased panting, standing, and increased rumen temperature. The strong association of IRT-Eye temperature with stress-related behaviours, as well as with rumen temperature and panting behaviour, highlights the potential for IRT-Eye to be utilised as a non-invasive tool to assess cattle responses in hot conditions. Full article
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11 pages, 456 KiB  
Article
Effect of Density and Lineage on Dorsal Surface Temperature, Performance, and Carcass Condemnation of Broiler Grillers
by Iara Cristina Marins, Bruno Giacomelli, Bruna Correia, Débora Cristina Olsson, Fabiana Moreira, Juahil Martins de Oliveira Júnior, Ivan Bianchi, Elizabeth Schwegler, Candice Bergmann Tanure, Monike Quirino, Tiago do Prado Paim, Natalia Nogueira Fonseca, Betina Raquel Cunha dos Santos and Vanessa Peripolli
Animals 2024, 14(15), 2195; https://doi.org/10.3390/ani14152195 - 28 Jul 2024
Viewed by 478
Abstract
The aims of this study were (i) to evaluate the effect of density, lineage, age, and time of day on dorsal surface temperature and (ii) to evaluate the effect of density and lineage on performance and carcass condemnations in broiler grillers. The evaluations [...] Read more.
The aims of this study were (i) to evaluate the effect of density, lineage, age, and time of day on dorsal surface temperature and (ii) to evaluate the effect of density and lineage on performance and carcass condemnations in broiler grillers. The evaluations were carried out in barns with the Dark House system, with two densities, 17 and 19 chickens/m2 and two lineages, Cobb and Ross. The dorsal surface temperature of the chickens was measured by infrared thermography at 7, 14, 21, 23, 25 and 27 days of age, four times a day. The average daily weight gain, feed conversion, mortality, partial carcass condemnations, as well as those due to arthritis and dermatosis were also evaluated. The highest dorsal surface temperatures were observed in Cobbs housed at a density of 17 chickens/m2, and in Ross housed at a density of 19 chickens/m2. Cobbs housed at a 17 chickens/m2 density showed the lowest feed conversion compared to Ross at the same density. Ross showed higher dorsal surface temperatures when compared to Cobbs at 14, 21, and 27 days. Cobbs showed higher percentages of partial carcass condemnation and arthritis compared to Ross. The higher density of broiler grillers in the Dark House system does not influence the dorsal surface temperature, performance, dermatosis, arthritis, and partial carcass condemnations. Full article
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10 pages, 1006 KiB  
Article
The Potential of Infrared Thermography for Early Pregnancy Diagnosis in Nili-Ravi Buffaloes
by Umair Riaz, Musadiq Idris, Mehboob Ahmed, Farah Ali, Umer Farooq and Liguo Yang
Animals 2024, 14(13), 1966; https://doi.org/10.3390/ani14131966 - 2 Jul 2024
Viewed by 771
Abstract
This study was designed to explore the potential of infrared thermography (IRT) as an alternate approach for early pregnancy diagnosis in buffaloes. The surface temperature (ST) of different regions (eyes, muzzle, flanks, and vulva) was determined in 27 buffaloes using IRT from the [...] Read more.
This study was designed to explore the potential of infrared thermography (IRT) as an alternate approach for early pregnancy diagnosis in buffaloes. The surface temperature (ST) of different regions (eyes, muzzle, flanks, and vulva) was determined in 27 buffaloes using IRT from the day of artificial insemination (AI; Day 0), and measurement was repeated every fourth day until Day 24 post-AI. From all regions, the ST in each thermograph was recorded at three temperature values (maximum, average, minimum). Pregnancy status was confirmed through ultrasonography on Day 30, and animals were retrospectively grouped as pregnant or non-pregnant for analysis of thermographic data. In pregnant buffaloes, all three values of ST were significantly greater (p ≤ 0.05) for the left flank, while, in the left eye and vulva, only the maximum and average values were significantly greater. By contrast, the maximum ST of the muzzle was significantly lower (p ≤ 0.05) in pregnant buffaloes compared to non-pregnant buffaloes. However, the ST of the right eye and right flank did not show significant temperature variation at any value. These findings suggest that IRT has the potential to identify thermal changes associated with pregnancy in buffaloes at an early stage. Full article
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18 pages, 18569 KiB  
Article
Thermographic Profiles in Livestock Systems under Full Sun and Shaded Pastures during an Extreme Climate Event in the Eastern Amazon, Brazil: El Niño of 2023
by Welligton Conceição da Silva, Jamile Andréa Rodrigues da Silva, Lucieta Guerreiro Martorano, Éder Bruno Rebelo da Silva, Carlos Eduardo Lima Sousa, Kedson Alessandri Lobo Neves, Cláudio Vieira de Araújo, Leonel António Joaquim, Thomaz Cyro Guimarães de Carvalho Rodrigues, Tatiane Silva Belo, Raimundo Nonato Colares Camargo-Júnior and José de Brito Lourenço-Júnior
Animals 2024, 14(6), 855; https://doi.org/10.3390/ani14060855 - 11 Mar 2024
Cited by 4 | Viewed by 1235
Abstract
The El Niño represents a substantial threat to pastures, affecting the availability of water, forage and compromising the sustainability of grazing areas, especially in the northern region of Brazil. Therefore, the objective of this study was to characterize the thermographic profile of three [...] Read more.
The El Niño represents a substantial threat to pastures, affecting the availability of water, forage and compromising the sustainability of grazing areas, especially in the northern region of Brazil. Therefore, the objective of this study was to characterize the thermographic profile of three production systems in the Eastern Amazon, Brazil. The study was conducted on a rural cattle farm in Mojuí dos Campos, Pará, Brazil, between August and November 2023. The experiment involved livestock production systems, including traditional, silvopastoral and integrated, with different conditions of shade and access to the bathing area. An infrared thermographic (IRT) camera was used, recording temperatures in different zones, such as areas with trees, pastures with forage and exposed pastures. The highest mean temperatures (p = 0.02) were observed in pastures with full sun from August to November. On the other hand, the lowest average temperatures were recorded in areas shaded by chestnut trees (Bertholletia excelsa). The highest temperature ranges were found in sunny areas and the lowest were recorded in shaded areas. The highest temperatures were observed in the pasture in full sun, while the lowest were recorded in areas shaded by chestnut trees (p < 0.0001). The interaction between the systems and treatments revealed significant temperature differences (p < 0.0001), with the native trees showing an average temperature of 35.9 °C, lower than the grasses and soil, which reached 61.2 °C. This research concludes that, under El Niño in the Eastern Amazon, areas shaded by Brazil nut trees had lower temperatures, demonstrating the effectiveness of shade. Native trees, compared to grasses and soil, showed the ability to create cooler environments, highlighting the positive influence on different species such as sheep, goats and cattle. Full article
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12 pages, 1606 KiB  
Article
Events with Different Emotional Valence Affect the Eye’s Lacrimal Caruncle Temperature Changes in Sheep
by Marta Comin, Elie Atallah, Matteo Chincarini, Silvia Michela Mazzola, Elisabetta Canali, Michela Minero, Bruno Cozzi, Emanuela Rossi, Giorgio Vignola and Emanuela Dalla Costa
Animals 2024, 14(1), 50; https://doi.org/10.3390/ani14010050 - 22 Dec 2023
Viewed by 1447
Abstract
Infrared thermography (IRT) has been recently applied to measure lacrimal caruncle temperature non-invasively since this region is related to the sympathetic response, and it seems a promising technique that is able to infer negative emotions in sheep (e.g., fear). However, the scientific literature [...] Read more.
Infrared thermography (IRT) has been recently applied to measure lacrimal caruncle temperature non-invasively since this region is related to the sympathetic response, and it seems a promising technique that is able to infer negative emotions in sheep (e.g., fear). However, the scientific literature so far is limited in understanding whether a caruncle’s temperature changes also in response to positive emotional states in sheep. Through classical conditioning, we aimed to assess how a positive or a negative event affects the physiological (lacrimal caruncle temperature measured with IRT and cortisol levels) and behavioral responses of sheep (ear position). Fourteen ewes from the same flock were randomly assigned to two treatment groups: positive (n = 7) and negative (n = 7). Each group was then trained through classical conditioning to associate a neutral auditory (ring bell) stimulus to an oncoming event: for the positive group, the presence of a food reward (maize grains), while for the negative one, the opening of an umbrella. After three weeks of training, before (at rest) and after (post-treatment), lacrimal caruncle temperature was non-invasively measured via IRT, and saliva samples were gently collected to measure cortisol levels. During treatment, sheep behavior was videorecorded and then analyzed using a focal animal sampling technique. At rest, the eye’s lacrimal caruncle temperature was similar in both groups, while post-treatment, a significant increase was shown only in the negative group (t-test; p = 0.017). In the anticipation phase, sheep in the positive group kept their ears forward longer compared to those in the negative one (Mann–Whitney; p < 0.014), 8.3 ± 2.1 s and 5.2 ± 4.2 s, respectively. The behavioral response observed reflects a learnt association between a neutral stimulus and events with different emotional valence. Cortisol concentration slightly increased in both groups post-treatment. Our results confirm that IRT is a non-invasive technique that can be useful when applied to assess how positive and negative events may affect the physiological response in sheep. Full article
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15 pages, 942 KiB  
Article
Caffeine Administration in Piglets with Low Birthweight and Low Vitality Scores, and Its Effect on Physiological Blood Profile, Acid–Base Balance, Gas Exchange, and Infrared Thermal Response
by Dina Villanueva-García, Marcelo Ghezzi, Patricia Mora-Medina, Ismael Hernández-Ávalos, Adriana Olmos-Hernández, Alejandro Casas-Alvarado, Karina Lezama-García, Adriana Domínguez-Oliva, Daniela Rodríguez-González and Miriam Marcet-Rius
Animals 2023, 13(22), 3491; https://doi.org/10.3390/ani13223491 - 12 Nov 2023
Cited by 1 | Viewed by 1350
Abstract
Intrapartum asphyxia, fetal hypoxia, and their consequences (e.g., acidosis, hypercapnia, hypoglycemia, and hypothermia) are the main factors related to physio-metabolic imbalances that increase neonatal mortality in piglets, particularly in piglets with low birthweight and low vitality scores. This study aimed to evaluate the [...] Read more.
Intrapartum asphyxia, fetal hypoxia, and their consequences (e.g., acidosis, hypercapnia, hypoglycemia, and hypothermia) are the main factors related to physio-metabolic imbalances that increase neonatal mortality in piglets, particularly in piglets with low birthweight and low vitality scores. This study aimed to evaluate the effect of three different doses of caffeine (10, 20, and 30 mg/kg) administered orally to 480 newborn piglets with low birthweight and low vitality scores. Blood gas parameters (pH, pO2, pCO2, and HCO3), physio-metabolic profile (Ca++, glucose, and lactate), and the thermal response assessed through infrared thermography in four thermal windows (ocular, auricular, snout, and hindlimb) and rectal temperature were evaluated during the first 24 h of life. Doses of 30 mg/kg resulted in significant differences at 24 h for all evaluated parameters, suggesting that caffeine administration improved the cardiorespiratory function and metabolic activity of piglets by reducing acidosis, restoring glycemia, and increasing surface and rectal temperature. In conclusion, caffeine at 30 mg/kg could be suggested as an appropriate dose to use in piglets with low birthweight and low vitality scores. Future research might need to study the presentation of adverse effects due to higher caffeine concentrations. Full article
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8 pages, 771 KiB  
Communication
Associations between Surface and Rectal Temperature Profiles of Low-Birth-Weight Piglets
by Bryony S. Tucker, Kiro R. Petrovski, Jessica R. Craig, Rebecca S. Morrison, Robert J. Smits and Roy N. Kirkwood
Animals 2023, 13(20), 3259; https://doi.org/10.3390/ani13203259 - 19 Oct 2023
Cited by 1 | Viewed by 1082
Abstract
The use of infrared cameras to record surface temperature has shown some promise in older pigs, but neonatal piglets are metabolically less mature and experience rapid temperature changes during their first 24 h. The present experiment aimed to compare rectal temperature to surface [...] Read more.
The use of infrared cameras to record surface temperature has shown some promise in older pigs, but neonatal piglets are metabolically less mature and experience rapid temperature changes during their first 24 h. The present experiment aimed to compare rectal temperature to surface temperature at the base of the ear, measured using an infrared camera, for piglets of different birth weights. During farrowing, 48 multiparous sows were monitored, and rectal and surface temperatures were recorded for their lower-birth-weight (≤1.2 kg) piglets within 3 min of birth and at 0.25, 0.50, 0.75, 1, 1.25, 1.50, 2, 3, 4, and 24 h. Piglet birth weights were assigned to one of three categories (BWC): BWC1 (≤0.80 kg), BWC2 (0.81 to 1.10 kg), or BWC3 (1.11 to 1.20 kg). Piglet rectal temperatures at 1.25 h after birth were assigned to one of three categories: RC1 (≤32.0 °C), RC2 (32.1 to 35.0 °C), or RC3 (≥35.1 °C). Surface temperatures showed a similar recovery pattern to rectal temperatures in the first 24 h across all piglet birth weights, although large and variable differences seen in the current study militate against surface temperature being an appropriate replacement for neonatal rectal temperature for use in production. Full article
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22 pages, 6091 KiB  
Article
Characterization of Thermal Patterns Using Infrared Thermography and Thermolytic Responses of Cattle Reared in Three Different Systems during the Transition Period in the Eastern Amazon, Brazil
by Welligton Conceição da Silva, Jamile Andréa Rodrigues da Silva, Éder Bruno Rebelo da Silva, Antônio Vinicius Correa Barbosa, Carlos Eduardo Lima Sousa, Katarina Cardoso de Carvalho, Maria Roseane Pereira dos Santos, Kedson Alexandri Lobo Neves, Lucieta Guerreiro Martorano, Raimundo Nonato Colares Camargo Júnior and José de Brito Lourenço-Júnior
Animals 2023, 13(17), 2735; https://doi.org/10.3390/ani13172735 - 28 Aug 2023
Cited by 10 | Viewed by 1651
Abstract
In the Lower Amazon mesoregion, there are basically three types of production systems: the traditional (without shade and no bathing area), the silvopastoral (with shade and no bathing area), and the integrated (with shade and bathing area). It is considered that the type [...] Read more.
In the Lower Amazon mesoregion, there are basically three types of production systems: the traditional (without shade and no bathing area), the silvopastoral (with shade and no bathing area), and the integrated (with shade and bathing area). It is considered that the type of production system influences the thermal comfort and productivity of cattle, so this research aims to evaluate the influence of these three types of production systems on the thermoregulation of Nellore cattle. The experiment was carried out on a rural property for raising cattle, located in Mojuí dos Campos, Pará, Brazil, during the transition period (June/July). Thirty bovine males (not castrated, aged between 18 and 20 months, average weight of 250 ± 36 kg, body condition score of 3.5, clinically healthy) were randomly divided into three groups: Silvopastoral System—SS (n = 10), Traditional System—TS (n = 10), and Integrated System—IS (n = 10). Climate variables were collected (air temperature (AT °C), relative humidity (RH %), wind speed (WS, m/s), solar radiation (SR), black globe temperature (BGT °C), and physiological parameters, such as respiratory rate (RR) and rectal temperature (RT)) at 6 a.m., 12 p.m., 6 p.m., and 12 a.m. to determine the thermal comfort situation of the animals. Thermographic images of the environment and animals were captured in order to obtain the body surface temperature (BST) through infrared thermography. The Benezra Thermal Comfort Index (BTCI), Environmental Stress Index (ESI), Equivalent Temperature Index (ETI), and Iberian Heat Tolerance Index (Iberian HTI) were used. The results showed that the silvopastoral system, with shading by chestnut trees and an ample vegetative area, presented better thermal conditions, with an average of 28.98 °C, in comparison with the traditional system (35.93 °C) and the integrated one (34.11 °C). It was observed that the body surface temperature of cattle did not differ significantly between the anatomical regions of the body and the studied systems (p > 0.05). As for the respiratory rate, the traditional system registered higher values, with an average of 41 movements per minute, indicating possible thermal stress (p < 0.05). The thermal comfort indices revealed that all systems presented moderate stress conditions during times of higher solar intensity. It is concluded that the silvopastoral system proved to be more favorable for cattle, providing shade and reducing thermal stress, which may have a positive impact on animal welfare and productivity in this region. Full article
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15 pages, 770 KiB  
Article
Is the Weight of the Newborn Puppy Related to Its Thermal Balance?
by Karina Lezama-García, Julio Martínez-Burnes, Míriam Marcet-Rius, Angelo Gazzano, Adriana Olmos-Hernández, Patricia Mora-Medina, Adriana Domínguez-Oliva, Alfredo M. F. Pereira, Ismael Hernández-Ávalos, Uri Baqueiro-Espinosa, Ana de Mira Geraldo, Alejandro Casas-Alvarado and Daniel Mota-Rojas
Animals 2022, 12(24), 3536; https://doi.org/10.3390/ani12243536 - 14 Dec 2022
Cited by 12 | Viewed by 2092
Abstract
Hypothermia, a factor associated with neonatal mortality, can occur immediately after birth as a protective mechanism to prevent hypoxic damage in neonates, or to reduce the metabolic rate to improve the chances of survival in the first hours of life. The heat interchange [...] Read more.
Hypothermia, a factor associated with neonatal mortality, can occur immediately after birth as a protective mechanism to prevent hypoxic damage in neonates, or to reduce the metabolic rate to improve the chances of survival in the first hours of life. The heat interchange through the superficial temperature of animals can be evaluated with infrared thermography (IRT). However, to date, there is no information on thermal windows in puppies. This study aimed to evaluate, with the use of IRT, the microcirculatory alterations in 8 different thermal windows identified at 7 different times in 289 newborn puppies assigned to different groups. Three thermograms were taken from four zones of each puppy: the facial, frontal, right lateral, and left lateral regions. Newborn puppies were grouped in 4 quartiles according to their weight: Q1 (126–226 g) n = 73, Q2 (227–330 g) n = 72, Q3 (331–387 g) n = 74, and Q4 (388–452 g) n = 70. A total of 8 thermal windows were considered at 7 evaluation times from Wet at birth until 24 h after birth (AB). Two-way mixed ANOVA within and between subjects’ design for each thermal window (eight models) was performed. Results revealed a positive correlation between the puppy’s weight and its ability to achieve thermostability in all the evaluated thermal windows. Statistically significant differences (p < 0.0001) between the 4 quartiles (Q1, Q2, Q3, and Q4) were found. The lowest temperatures were recorded when the pups were still wet and the highest at 24 h AB. Thermal windows with the highest temperatures were abdominal (34.234 ± 0.056 °C), thoracic (33.705 ± 0.049 °C), nasal (30.671 ± 0.110 °C), and upper left palpebral (34.066 ± 0.052 °C), while the lowest were thoracic limb brachial biceps (27.534 ± 0.051 °C), thoracic limb elbow (27.141 ± 0.049 °C), thoracic limb metacarpal (27.024 ± 0.062 °C), and femoral pelvic limb (27.654 ± 0.055 °C). Assessing the thermal response in newborn puppies can help identify drastic temperature reductions or deficient thermoregulatory compensation during the first hours of life, preventing the consequences of hypothermia. Full article
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Review

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19 pages, 2791 KiB  
Review
Hypothalamic Neuromodulation and Control of the Dermal Surface Temperature of Livestock during Hyperthermia
by Juliana Sarubbi, Julio Martínez-Burnes, Marcelo Daniel Ghezzi, Adriana Olmos-Hernandez, Pamela Anahí Lendez, María Carolina Ceriani and Ismael Hernández-Avalos
Animals 2024, 14(12), 1745; https://doi.org/10.3390/ani14121745 - 9 Jun 2024
Viewed by 1147
Abstract
Hyperthermia elicits several physiological and behavioral responses in livestock to restore thermal neutrality. Among these responses, vasodilation and sweating help to reduce core body temperature by increasing heat dissipation by radiation and evaporation. Thermoregulatory behaviors such as increasing standing time, reducing feed intake, [...] Read more.
Hyperthermia elicits several physiological and behavioral responses in livestock to restore thermal neutrality. Among these responses, vasodilation and sweating help to reduce core body temperature by increasing heat dissipation by radiation and evaporation. Thermoregulatory behaviors such as increasing standing time, reducing feed intake, shade-seeking, and limiting locomotor activity also increase heat loss. These mechanisms are elicited by the connection between peripheral thermoreceptors and cerebral centers, such as the preoptic area of the hypothalamus. Considering the importance of this thermoregulatory pathway, this review aims to discuss the hypothalamic control of hyperthermia in livestock, including the main physiological and behavioral changes that animals adopt to maintain their thermal stability. Full article
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14 pages, 3921 KiB  
Review
Use of Infrared Thermography and Heart Rate Variability to Evaluate Autonomic Activity in Domestic Animals
by Marcelo Daniel Ghezzi, María Carolina Ceriani, Adriana Domínguez-Oliva, Pamela Anahí Lendez, Adriana Olmos-Hernández, Alejandro Casas-Alvarado and Ismael Hernández-Avalos
Animals 2024, 14(9), 1366; https://doi.org/10.3390/ani14091366 - 1 May 2024
Cited by 2 | Viewed by 1997
Abstract
Most of the responses present in animals when exposed to stressors are mediated by the autonomic nervous system. The sympathetic nervous system, known as the one responsible for the “fight or flight” reaction, triggers cardiovascular changes such as tachycardia or vasomotor alterations to [...] Read more.
Most of the responses present in animals when exposed to stressors are mediated by the autonomic nervous system. The sympathetic nervous system, known as the one responsible for the “fight or flight” reaction, triggers cardiovascular changes such as tachycardia or vasomotor alterations to restore homeostasis. Increase in body temperature in stressed animals also activates peripheral compensatory mechanisms such as cutaneous vasodilation to increase heat exchange. Since changes in skin blood flow influence the amount of heat dissipation, infrared thermography is suggested as a tool that can detect said changes. The present review aims to analyze the application of infrared thermography as a method to assess stress-related autonomic activity, and their association with the cardiovascular and heart rate variability in domestic animals. Full article
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16 pages, 6259 KiB  
Review
Utilization of Infrared Thermography in Assessing Thermal Responses of Farm Animals under Heat Stress
by Marcelo Daniel Ghezzi, Fabio Napolitano, Alejandro Casas-Alvarado, Ismael Hernández-Ávalos, Adriana Domínguez-Oliva, Adriana Olmos-Hernández and Alfredo M. F. Pereira
Animals 2024, 14(4), 616; https://doi.org/10.3390/ani14040616 - 14 Feb 2024
Cited by 10 | Viewed by 1578
Abstract
Heat stress is a condition that can affect the health, performance, and welfare of farm animals. The perception of thermal stress leads to the activation of the autonomic nervous system to start a series of physiological and behavioral mechanisms to restore thermostability. One [...] Read more.
Heat stress is a condition that can affect the health, performance, and welfare of farm animals. The perception of thermal stress leads to the activation of the autonomic nervous system to start a series of physiological and behavioral mechanisms to restore thermostability. One of these mechanisms is vasodilation of peripheral blood vessels to increase heat loss through the skin. Due to this aspect, infrared thermography has been suggested as a method to assess the thermal state of animals and predict rectal temperature values noninvasively. However, it is important to consider that predicting rectal temperature is challenging, and its association with IRT is not always a direct linear relationship. The present review aims to analyze the neurobiological response associated with heat stress and how thermal imaging in different thermal windows can be used to recognize heat stress in farmed ungulates. Full article
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19 pages, 3277 KiB  
Review
Thermal Imaging as a Method to Indirectly Assess Peripheral Vascular Integrity and Tissue Viability in Veterinary Medicine: Animal Models and Clinical Applications
by Daniel Mota-Rojas, Asahi Ogi, Dina Villanueva-García, Ismael Hernández-Ávalos, Alejandro Casas-Alvarado, Adriana Domínguez-Oliva, Pamela Lendez and Marcelo Ghezzi
Animals 2024, 14(1), 142; https://doi.org/10.3390/ani14010142 - 31 Dec 2023
Cited by 8 | Viewed by 1667
Abstract
Infrared thermography (IRT) is a technique that indirectly assesses peripheral blood circulation and its resulting amount of radiated heat. Due to these properties, thermal imaging is currently applied in human medicine to noninvasively evaluate peripheral vascular disorders such as thrombosis, thromboembolisms, and other [...] Read more.
Infrared thermography (IRT) is a technique that indirectly assesses peripheral blood circulation and its resulting amount of radiated heat. Due to these properties, thermal imaging is currently applied in human medicine to noninvasively evaluate peripheral vascular disorders such as thrombosis, thromboembolisms, and other ischemic processes. Moreover, tissular damage (e.g., burn injuries) also causes microvasculature compromise. Therefore, thermography can be applied to determine the degree of damage according to the viability of tissues and blood vessels, and it can also be used as a technique to monitor skin transplant procedures such as grafting and free flaps. The present review aims to summarize and analyze the application of IRT in veterinary medicine as a method to indirectly assess peripheral vascular integrity and its relation to the amount of radiated heat and as a diagnostic technique for tissue viability, degree of damage, and wound care. Full article
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26 pages, 9810 KiB  
Review
Assessment of Pain and Inflammation in Domestic Animals Using Infrared Thermography: A Narrative Review
by Alexandra L. Whittaker, Ramon Muns, Dehua Wang, Julio Martínez-Burnes, Ismael Hernández-Ávalos, Alejandro Casas-Alvarado, Adriana Domínguez-Oliva and Daniel Mota-Rojas
Animals 2023, 13(13), 2065; https://doi.org/10.3390/ani13132065 - 22 Jun 2023
Cited by 19 | Viewed by 2630
Abstract
Pain assessment in domestic animals has gained importance in recent years due to the recognition of the physiological, behavioral, and endocrine consequences of acute pain on animal production, welfare, and animal model validity. Current approaches to identifying acute pain mainly rely on behavioral-based [...] Read more.
Pain assessment in domestic animals has gained importance in recent years due to the recognition of the physiological, behavioral, and endocrine consequences of acute pain on animal production, welfare, and animal model validity. Current approaches to identifying acute pain mainly rely on behavioral-based scales, quantifying pain-related biomarkers, and the use of devices monitoring sympathetic activity. Infrared thermography is an alternative that could be used to correlate the changes in the superficial temperature with other tools and thus be an additional or alternate acute pain assessment marker. Moreover, its non-invasiveness and the objective nature of its readout make it potentially very valuable. However, at the current time, it is not in widespread use as an assessment strategy. The present review discusses scientific evidence for infrared thermography as a tool to evaluate pain, limiting its use to monitor acute pain in pathological processes and invasive procedures, as well as its use for perioperative monitoring in domestic animals. Full article
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28 pages, 8960 KiB  
Review
Thermal Imaging to Assess the Health Status in Wildlife Animals under Human Care: Limitations and Perspectives
by Daniel Mota-Rojas, Alfredo M. F. Pereira, Julio Martínez-Burnes, Adriana Domínguez-Oliva, Patricia Mora-Medina, Alejandro Casas-Alvarado, Jennifer Rios-Sandoval, Ana de Mira Geraldo and Dehua Wang
Animals 2022, 12(24), 3558; https://doi.org/10.3390/ani12243558 - 15 Dec 2022
Cited by 14 | Viewed by 4601
Abstract
Promoting animal welfare in wildlife species under human care requires the implementation of techniques for continuously monitoring their health. Infrared thermography is a non-invasive tool that uses the radiation emitted from the skin of animals to assess their thermal state. However, there are [...] Read more.
Promoting animal welfare in wildlife species under human care requires the implementation of techniques for continuously monitoring their health. Infrared thermography is a non-invasive tool that uses the radiation emitted from the skin of animals to assess their thermal state. However, there are no established thermal windows in wildlife species because factors such as the thickness or color of the skin, type/length of coat, or presence of fur can influence the readings taken to obtain objective, sensitive values. Therefore, this review aims to discuss the usefulness and application of the ocular, nasal, thoracic, abdominal, and podal anatomical regions as thermal windows for evaluating zoo animals’ thermal response and health status. A literature search of the Web of Science, Science Direct, and PubMed databases was performed to identify relevant studies that used IRT with wild species as a complementary diagnostic tool. Implementing IRT in zoos or conservation centers could also serve as a method for determining and monitoring optimal habitat designs to meet the needs of specific animals. In addition, we analyze the limitations of using IRT with various wildlife species under human care to understand better the differences among animals and the factors that must be considered when using infrared thermography. Full article
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9 pages, 6947 KiB  
Case Report
Infrared Thermography of the Blowhole as a Potential Diagnostic Tool for Health Assessment in Killer Whales (Orcinus orca)
by Jennifer P. Russell, Steve D. Osborn, Kelsey E. S. Herrick, Todd L. Schmitt and Todd Robeck
Animals 2024, 14(13), 1867; https://doi.org/10.3390/ani14131867 - 25 Jun 2024
Viewed by 867
Abstract
Killer whales (Orcinus orca) are experiencing increasing environmental pressures, with some ecotypes being identified as endangered, and the development and validation of non-invasive health assessment tools is critical for assessing the well-being of individuals within these endangered populations. Infrared thermography of [...] Read more.
Killer whales (Orcinus orca) are experiencing increasing environmental pressures, with some ecotypes being identified as endangered, and the development and validation of non-invasive health assessment tools is critical for assessing the well-being of individuals within these endangered populations. Infrared thermography of the blowhole is a non-contact method of temperature measurement that was recently investigated in killer whales in managed care. Two male killer whales presenting with clinical signs at separate institutions had veterinary clinical health assessments performed, which included infrared thermography of the blowhole as well as concurrent rectal temperature measurement. The current case report is aimed at describing the clinical use of infrared thermography of the blowhole as a method to detect elevated body temperature in two killer whales. Both animals exhibited blowhole temperatures above the previously reported values (36.4 °C and 37.6 °C; the mean in healthy whales is reported to be 34.21 ± 1.47 °C) with concurrently elevated rectal temperatures, as well as clinicopathologic findings consistent with a systemic inflammatory response (e.g., neutrophilia, increased fibrinogen and erythrocyte sedimentation rate, hypoferritinemia). Following veterinary intervention, both animals’ blowhole and rectal temperatures returned to baseline. Infrared thermography of the blowhole represents a promising tool for the identification of pyrexic animals and with further investigation may be considered as part of conservation health assessments for threatened free-ranging populations. Full article
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17 pages, 743 KiB  
Commentary
Thermoregulation during Field Exercise in Horses Using Skin Temperature Monitoring
by Elisabeth-Lidwien J. M. M. Verdegaal, Gordon S. Howarth, Todd J. McWhorter and Catherine J. G. Delesalle
Animals 2024, 14(1), 136; https://doi.org/10.3390/ani14010136 - 30 Dec 2023
Cited by 4 | Viewed by 1878
Abstract
Hyperthermia and exertional heat illness (EHI) are performance and welfare issues for all exercising horses. Monitoring the thermoregulatory response allows for early recognition of metabolic heat accumulation during exercise and the possibility of taking prompt and effective preventative measures to avoid a further [...] Read more.
Hyperthermia and exertional heat illness (EHI) are performance and welfare issues for all exercising horses. Monitoring the thermoregulatory response allows for early recognition of metabolic heat accumulation during exercise and the possibility of taking prompt and effective preventative measures to avoid a further increase in core body temperature (Tc) leading to hyperthermia. Skin temperature (Tsk) monitoring is most used as a non-invasive tool to assess the thermoregulatory response pre- and post-exercise, particularly employing infrared thermographic equipment. However, only a few studies have used thermography to monitor skin temperature continuously during exercise. This commentary provides an overview of studies investigating surface skin temperature mainly by infrared thermography (IRT) during exercise. The scientific evidence, including methodologies, applications, and challenges associated with (continuous) skin temperature monitoring in horses during field exercise, is discussed. The commentary highlights that, while monitoring Tsk is straightforward, continuous Tsk alone does not always reliably estimate Tc evolvement during field exercise. In addition, inter-individual differences in thermoregulation need to be recognized and accounted for to optimize individual wellbeing. With the ongoing development and application of advanced wearable monitoring technology, there may be future advances in equipment and modeling for timely intervention with horses at hyperthermic risk to improve their welfare. However, at this point, infrared thermographic assessment of Tsk should always be used in conjunction with other clinical assessments and veterinary examinations for a reliable monitoring of the welfare of the horse. Full article
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