母猪热应激敏感指标体系的研究进展

doi:10.3864/j.issn.0578-1752.2020.22.015

Abstract

Abstract:

Sows are easy to suffer from heat stress in the high temperature environment due to their thick subcutaneous fat and undeveloped sweat glands. Previous studies have showed that heat stress could change physiological state and blood biochemical components of the sows, reduce their fertility and then result in serious economic losses for pig industry. However, the sensitive indicators for heat stress in sow are not systematically evaluated and compared. Moreover, the tolerance for heat stress in sows is affected by many factors, including their heredity, age, and diet, making the accurate evaluation of sow heat stress more difficult and becoming an important factor restricting the establishment of suitable environmental parameters for sows. Based on a systematic literature investigation, the purpose of this review was to summarize the indicators for heat stress in sows on phenotypic, physiological, biochemical, and molecular levels, and also their sensitivities and its feasibility to be used as an evaluation index system for diagnosis of heat stress and evaluation of optimal environmental parameters for sows. It was concluded that the most sensitive indicators for heat stress in sows included skin temperature, respiratory rate, rectal temperature and expression of heat shock protein 70 (HSP70) in the liver and blood. The secondly sensitive indicators included: blood cortisol (COR), aspartate transferase (AST), alanine transferase (ALT), creatine kinase (CK) and lactate dehydrogenase (LDH). Other indicators that could be used as an auxiliary reference, including serum protein, blood glucose, blood immune cells, K ⁺, and Na ⁺. Moreover, skin temperature, respiratory rate, rectal temperature and expression of heat shock protein 70 (HSP70) could be used as indicators to evaluate long-term heat stress of sows. In addition, though the behavior changes were insensitive, they were still valuable since the measuring cost was low, and no stress on animals.

Key words: sow, heat stress, physiology, temperature, blood biochemistry, sensitive indicator

YUAN XiongKun,JIANG LiLi,TAO ShiYu,ZANG JianJun,WANG JunJun. Research Progresses on Sensitive Index System of Heat Stress in Sows[J].Scientia Agricultura Sinica, 2020, 53(22): 4691-4699.

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