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Animals
Special Issues
Ruminant Production and Reproductive Performance in Tropical Environments
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Ruminant Production and Reproductive Performance in Tropical Environments

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

Deadline for manuscript submissions: 30 September 2025 | Viewed by 3002

Special Issue Editors

Dr. István Egerszegi

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Guest Editor
Department of Animal Husbandry and Animal Welfare, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, Páter K. Str. 1., 2100 Gödöllő, Hungary
Interests: ruminants; pig; breeding; reproduction; gene conservation; local breeds
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Nesrein M. Hashem

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Guest Editor
Department of Animal and Fish Production, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt
Interests: ruminants; reproduction; climate change; nano-encapsulation; phytogenic; probiotic; antimicrobial alternatives; immunity
Special Issues, Collections and Topics in MDPI journals
Dr. Rafael Goes

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Guest Editor
Agricultural College, Federal University od Grande Dourados, Dourados, Brazil
Interests: ruminants; nutrition; adittive;antimicrobial alternatives; alternatives feeds

Special Issue Information

Dear Colleagues,

Climate change poses a major global threat to the agriculture and livestock industries. Ruminants are considered one of the main sources of animal protein and raw materials for other industries. Globally, more than 50% of the cattle and goat populations, nearly 80 % of buffalo, and 30% of sheep are produced in the tropics. Under recent climate change conditions, it is expected that ruminants, especially those in the tropics, will face a yearly increase in heat waves during their lifetimes. Climate change in the tropics is characterized by a high ambient temperature, high humidity, and drought. These environmental circumstances are unsuitable for most ruminant species to express their maximum productive/reproductive capacities and maintain good health statuses. This Special Issue aims to collect cutting-edge research presenting innovative solutions to maintain ruminant production sustainability under tropical conditions. These studies should be underpinned by scientific information on the subcellular and cellular responses of animals, their genetic backgrounds regarding resilience, and their tolerance or adaptation to the challenges of a changing climate. We are seeking grazing, feeding, management, and welfare practices as well as assisted reproductive techniques and artificial intelligence-based solutions, either in small or large farming systems, that can improve production, product quality, quantity, and food safety in these areas. 

We invite you to contribute original research articles and reviews to this Special Issue to broaden our knowledge on the hot topic of climate-smart agriculture, including the livestock sector, which has fewer studies in the literature compared to its plant/crop/forest/aquatic counterparts.

Dr. István Egerszegi
Prof. Dr. Nesrein M. Hashem
Dr. Rafael Goes
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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

  • ruminant
  • tropics
  • heat stress
  • production
  • fertility
  • welfare
  • management
  • feeding
  • local breeds
  • CSA

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

15 pages, 2561 KB  
Article
Large-Scale Embryo Transfer Operation in Dromedary Camels: Retrospective Analysis of the Association Between Key Clinical Factors and the 2-Month Pregnancy Rate
by Taher Kamal Osman, Sayed Taha Ismail and Hossam R. El-Sherbiny
Animals 2025, 15(13), 1859; https://doi.org/10.3390/ani15131859 - 24 Jun 2025
Viewed by 532
Abstract
ET is used in camel reproduction to increase the reproductive potential of elite females selected for production and show. This retrospective study analyzed the association between factors related to embryo flushing (flushing fluid turbidity and debris), embryo quality (grades 1–4), recipient uterine status [...] Read more.
ET is used in camel reproduction to increase the reproductive potential of elite females selected for production and show. This retrospective study analyzed the association between factors related to embryo flushing (flushing fluid turbidity and debris), embryo quality (grades 1–4), recipient uterine status (tone and endometrial microcalcifications (EM)), farm and its locations (Qassim and Hail), as well high and low temperature on the likelihood of establishment of the 2-month pregnancy rate (PR) in dromedary camels. A total of 4360 embryos were transferred to 2947 recipients in this study. Logistic regression analysis (binary) was applied to evaluate the association between the selected factors and PR in month two. The likelihood of PR was affected by embryo quality (p < 0.01), EMs (p < 0.01), and farm (p < 0.05) and its location (p < 0.01). Transferring embryos to low (p < 0.01) or medium (p < 0.05) EM recipients decreased the likelihood of PR by ~1.3 times compared to uteri without EM. Grade 3 or 4 embryo transfer decreased the likelihood of PR by ~1.9 and 2.6 times, respectively, compared to grade 1 embryos (p< 0.01). In Saudi Arabia, applying an ET program in dromedaries in the Hail region raised the prediction of PR over the Qassim region by 1.2 times. Temperature changes had no effect on PR; however, higher temperature only affected the PR when grade 4 embryos were transferred. In conclusion, the likelihood of PR was higher with the transfer of grade 1 or 2 embryos in an EM-free uterus in the Hail region (Saudi Arabia). PR was only affected by higher temperature in the case of transferring grade 4 embryos. Full article
(This article belongs to the Special Issue Ruminant Production and Reproductive Performance in Tropical Environments)
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14 pages, 321 KB  
Article
In Vitro Embryos of Romosinuano and Tropical Milking Cattle during Three Seasons in Veracruz, Mexico
by Froylan Rosales-Martínez, Carlos Miguel Becerril-Pérez, Adalberto Rosendo-Ponce, Alberto Riaño-Gaya, César Cortez-Romero, Jaime Gallegos-Sánchez and Salvador Romo-García
Animals 2024, 14(13), 1922; https://doi.org/10.3390/ani14131922 - 29 Jun 2024
Cited by 2 | Viewed by 1571
Abstract
One of the main factors that influences the fertility of cattle in grazing systems in hot tropical climates is heat stress. The objective of this study was to evaluate the effect of season, breed, hormonal and physiological condition on the quantity and quality [...] Read more.
One of the main factors that influences the fertility of cattle in grazing systems in hot tropical climates is heat stress. The objective of this study was to evaluate the effect of season, breed, hormonal and physiological condition on the quantity and quality of cumulus–oocyte complexes (COCs) and embryos produced in vitro, from Romosinuano (RM) and Tropical Milking (TM) donors. Three ovum pick-up and in vitro fertilization (OPU-IVF) were performed, one per season: hot dry (HD; 10, 10), hot humid (HH; 9, 9) and fresh dry (FD; 7, 10) in RM and LT donors. Serum levels of cortisol, insulin and glucose were measured, in addition to heart rate (HR), respiratory rate (RR) and rectal temperature (RT). Effect of season x genotype interaction (p ≤ 0.05) was observed in all COC variables and only in cleavage embryos (CLI) (p ≤ 0.05). Body weight (BW) affected all COC variables (p ≤ 0.01), except unviable (UNV) although affected degenerated embryos (DEG) (p ≤ 0.01) and total blastocysts (BLAST) (p ≤ 0.01). Cow age only affected viable COCs (VIAB) (p ≤ 0.05), code one blastocysts (BC1) and BLAST (p ≤ 0.01). Cortisol affected total COCs (COCsT), VIAB and total matured in vitro (TMIV) (p ≤ 0.01), as well as CLI, BC1 (p ≤ 0.01) and BLAST (p ≤ 0.05). Insulin affected COCsT (p ≤ 0.01), UNV (p ≤ 0.05), denuded oocytes (DE) (p ≤ 0.01), BC1 and code two blastocysts (BC2) (p ≤ 0.01). Glucose affected all COC variables (p ≤ 0.01), except UNV and all embryo variables except BC2. HR affected COCsT, DE, TMIV (p ≤ 0.01), CLI, BLAST and DEG (p ≤ 0.05). RR affected COCsT, UNV, VIAB, CLI (p ≤ 0.05), BC1, BLAST and DEG (p ≤ 0.01). RT only affected DE, VIAB (p ≤ 0.01) and BLAST (p ≤ 0.05). The seasonal climatic year variation of Veracruz and changes in physiological and hormonal variables have diverse effects on the cumulus–oocyte complexes and embryos produced by RM and TM donors. Full article
(This article belongs to the Special Issue Ruminant Production and Reproductive Performance in Tropical Environments)
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