Influence of management systems on severity of heat stress on reproductive performance of rams in the tropics – a review

IF 1.9 4区 农林科学 Q1 Veterinary
Mohd Shahmi Hakimi Mazlishah, Nuradilla Mohamad Fauzi, Mohd Fadzil Firdzaus Mohd Nor, Noor Hashida Hashim
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Abstract

Abstract Sheep are an important source of protein for humans, and recent decades have seen a significant increase in the production of sheep-based products, thus indicating an increase in demand for this commodity. At a time when this sector is growing, sheep are exposed to various challenges. These include climate change, which can cause heat stress in sheep, including rams, which later negatively affects their growth and reproductive performance. Exposure to heat stress results in physiological and reproductive behaviour responses in rams, which could also be used to visually identify the effect of heat stress as it will affect the productivity of livestock. In addition, the year-round hot and humid climate of the tropics is expected to contribute to a higher probability of heat stress occurrences in rams reared in developing countries around the equator. Nevertheless, the adaptability of rams to heat stress varies according to their origin, whereby native breeds tend to adapt better. Despite that, native breeds still can be affected by adverse environmental conditions and rely on thermoregulation mechanisms to mitigate heat stress. This results in numerous negative physiological changes, such as sweating and increased heart rate. This review highlights the effects of heat stress on the physiology, reproductive behaviour and reproductive performance of male sheep. The review also discusses the impact of management systems on heat stress in rams, which affects sheep productivity.
热带地区热应激管理制度对公羊繁殖性能的影响综述
抽象的羊是人类的一个重要的蛋白质来源,和近几十年显著增加sheep-based产品的生产,从而表明对该商品的需求增加。在这个行业不断发展的时期,绵羊面临着各种挑战。其中包括气候变化,它会导致包括公羊在内的绵羊出现热应激,随后对它们的生长和繁殖性能产生负面影响。暴露于热应激会导致公羊的生理和生殖行为反应,这也可以用来直观地识别热应激的影响,因为它会影响牲畜的生产力。此外,全年炎热和潮湿的气候,热带地区预计将导致更高的热应力概率出现在发展中国家的公羊饲养在赤道周围。然而,公羊对热应激的适应能力因其来源而异,因此本地品种往往适应得更好。尽管如此,本土品种仍然会受到不利环境条件的影响,并依靠体温调节机制来减轻热应激。这会导致许多负面的生理变化,如出汗和心率加快。综述了热应力的影响,在生理、生殖行为和生殖公绵羊的性能。本文还讨论了管理制度对公羊热应激的影响,热应激会影响羊的生产能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Annals of Animal Science
Annals of Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.80
自引率
5.30%
发文量
138
期刊介绍: Annals of Animal Science accepts original papers and reviews from the different topics of animal science: genetic and farm animal breeding, the biology, physiology and reproduction of animals, animal nutrition and feedstuffs, environment, hygiene and animal production technology, quality of animal origin products, economics and the organization of animal production.
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