Lower Ammonia in Animal Housing Systems, Better Animal Health and Improved Welfare

A special issue of Animals (ISSN 2076-2615). This special issue belongs to the section "Animal Welfare".

Deadline for manuscript submissions: 15 January 2026 | Viewed by 1219

Special Issue Editors


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Guest Editor
Department of Agricultural Structure and Bioenvironmental Engineering, China Agricultural University, Beijing, China
Interests: poultry environment control; biosecurity; precision poultry farming; bionenvironmental engineering
Special Issues, Collections and Topics in MDPI journals
Department of Animal Science, University of Tennessee, Knoxville, TN 37996, USA
Interests: precision poultry farming that addresses challenges in poultry production regarding smart sensoring; robotics; behavior monitoring; welfare assessment; airborne transmission of pathogens; environment management
Special Issues, Collections and Topics in MDPI journals
College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Interests: energy saving; low-carbon; emission reduction; agricultural construction; sustainable energy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ammonia (NH₃) emissions from animal housing systems pose significant challenges to animal health, welfare, and environmental sustainability. Elevated ammonia concentrations in livestock environments are linked to respiratory diseases, reduced growth performance, immunosuppression, and behavioral stress in animals, ultimately affecting productivity and farm profitability. Furthermore, ammonia contributes to environmental pollution through atmospheric deposition and water contamination, exacerbating ecosystem damage and climate change.

This Special Issue will explore innovative strategies for reducing ammonia emissions in animal production systems while enhancing animal health and welfare. By fostering interdisciplinary collaboration, this Special Issue will advance sustainable livestock production practices that benefit both animals and the environment. This Special Issue welcomes contributions that bridge the gap between research and practical solutions, promoting healthier animals and more sustainable farming systems.

For this Special Issue, we invite researchers to contribute their recent findings, including original research, reviews, and case studies, especially focusing on, but not limited to, the following:

  • Ammonia emissions from livestock operations;
  • Monitoring and measurement;
  • Novel housing designs;
  • Facility improvement;
  • Feed and feeding optimization;
  • Nutritional interventions;
  • Strategies and technologies;
  • Precision farming approaches.

We look forward to receiving your contributions.

Dr. Weichao Zheng
Dr. Yang Zhao
Dr. Yang Wang
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Animals is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ammonia mitigation
  • animal housing systems
  • livestock health
  • animal welfare
  • manure management
  • air quality
  • sustainable agriculture
  • respiratory diseases
  • precision livestock farming
  • environmental pollution

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Published Papers (2 papers)

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Research

11 pages, 1901 KB  
Article
Effects of Dust Bath Design on Hen Behavior in New Aviary Systems in China
by Zhihao Zhang, Qian Zhang, Jianying Xu, Baoming Li, Weichao Zheng and Yang Wang
Animals 2025, 15(20), 2946; https://doi.org/10.3390/ani15202946 - 10 Oct 2025
Viewed by 143
Abstract
Alternative housing systems for laying hens, such as the aviary, promote the expression of dustbathing behavior by providing substrate materials to improve their welfare. However, extensive litter areas in aviaries can lead to reduced air quality and increased incidence of diseases, making them [...] Read more.
Alternative housing systems for laying hens, such as the aviary, promote the expression of dustbathing behavior by providing substrate materials to improve their welfare. However, extensive litter areas in aviaries can lead to reduced air quality and increased incidence of diseases, making them unsuitable for deployment in new large cage aviary unit (LCAU) systems in China. Dust baths have advantages in terms of continuous availability, but their design lacks unified standards. This study explored the effects of different areas, shapes (circular and square), and substrate depths (1 cm, 5 cm, 9 cm) of dust baths on dustbathing behavior in LCAU systems by recording digital video. Each LCAU system was initially populated with 305 Jingfen No. 2 laying hens at 50 days of age. The dust baths were initially placed on the bottommost tier at 66 days of age. The results showed that after approximately 3 weeks of adaptation to dustbathing, the average daily proportion of dustbathing hens within the flock stabilized at approximately 10%. A 50 cm diameter circular dust bath could accommodate their dustbathing requirements. Increasing the number of circular dust baths to 2 did not significantly affect the daily proportion of dustbathing hens. Both the circular dust bath and a 5 cm depth substrate resulted in better expression of the hens’ side rubbing behavior and the lower frequency of tossing behavior. Full article
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14 pages, 1546 KB  
Article
Effects of Heat Stress on Production Performance and Protein Metabolism of Skeletal Muscle in Meat Rabbits
by Gongyan Liu, Ce Liu, Haitao Sun, Liya Bai, Liping Yang, Yin Zhang and Shuxia Gao
Animals 2025, 15(17), 2560; https://doi.org/10.3390/ani15172560 - 31 Aug 2025
Cited by 1 | Viewed by 712
Abstract
The purpose of this experiment was to study the effects of heat stress on the performance and protein metabolism of skeletal muscle in meat rabbits. A total of 160 New Zealand White rabbits aged 80 days with mean initial body weights of 2359 [...] Read more.
The purpose of this experiment was to study the effects of heat stress on the performance and protein metabolism of skeletal muscle in meat rabbits. A total of 160 New Zealand White rabbits aged 80 days with mean initial body weights of 2359 ± 200 g were randomly divided into a control group and a heat stress group. The experiment duration was 20 days. Heat stress treatment reduced the growth performance and slaughter performance of the rabbits (p < 0.05) and increased muscle yellowness (b*, p < 0.05). In addition, heat stress treatment increased the concentrations of leptin, cholesterol, high-density lipoprotein (HDL) cholesterol, and low-density lipoprotein (LDL) cholesterol in serum (p < 0.05), and decreased the serum total protein and immunoglobulin (IgG, IgM, and IgA) contents of rabbits. Under the criteria fold-change ≥ 1.20 or ≤0.84 and p-value ≤ 0.05, 7 up-regulated proteins and 122 down-regulated proteins were screened. A gene ontology (GO) enrichment analysis of the differentially expressed proteins was performed. The most enriched specific GO terms among the differential proteins were response to stress, extracellular region, and protein binding in the biological process (BP), cellular component (CC), and molecular function (MF) categories, respectively, and the most enriched pathway was the PI3K/Akt signalling pathway. In conclusion, heat stress could reduce the carcass yield of meat rabbits, change the physical characteristics of the skeletal muscle, and influence protein metabolism by changing blood indices, potentially through the PI3K/Akt signalling pathway. Full article
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