›› 2018, Vol. 45 ›› Issue (9): 2433-2439.doi: 10.16431/j.cnki.1671-7236.2018.09.011

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Research Progress on Influence of High Temperature on Lactation and Related Regulation Hormones of Sows

ZHANG Haojie, HU Baoyu, XIONG Jiali, CHEN Ting, SUN Jiajie, LUO Junyi, XI Qianyun, JIANG Qingyan, ZHANG Yongliang   

  1. College of Animal Science, South China Agricultural University, Guangzhou 510642, China
  • Received:2018-03-08 Online:2018-09-20 Published:2018-09-26

Abstract:

The production and quality of breast milk is crucial for the survival rate,growth rate and health condition of piglets.Hyperthermia is one of the important environmental factors that affect the health of animal lactation.Especially in summer,animals are easily subjected to heat stress due to the long-time high temperature.In addition,the process of lactation is strictly regulated by the body's endocrine system,involving a variety of hormones,such as prolactin (PRL),growth hormone (GH) and insulin-like growth factor 1 (IGF-1).Many production data and researches indicated that hyperthermia induced the decline of food intake and lactation performance and causes changes in the endocrine state of the animal,which seriously affected sows and piglets.Therefore,in order to guarantee the health status of sows and obtain a better growth performance of piglets,it is necessary to find out how hyperthermia influences the sows and related hormones during the process of lactation.In this review,the authors summarized the effects of hyperthermia on milk production,milk composition and hormones related to lactation,founding that hyperthermia will reduce milk production and change the contents of lactose,milk fat,and lactoprotein,as well as the level of hormones related to lactation.It is expected to provide some references for researches on endocrine regulation mechanisms of environmental factors in animal lactation,as well as explorations on appropriate mitigation measures.

Key words: hyperthermia; sow; lactation; milk composition; hormones

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