Department of Veterinary Medical Science, University of Parma, Parma, Italy.
Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland.
Theriogenology. 2017 Jul 1;96:111-117. doi: 10.1016/j.theriogenology.2017.04.004. Epub 2017 Apr 3.
In gilts and sows, the summer-autumn period often is characterized by reduced fertility. Heat stress and long photoperiods during the warm season can cause a reduction in feed intake and an imbalance of the hypothalamic-hypophysial-ovarian axis. The increased variability in the interval between oestrus onset and ovulation results in an increased number of poorly timed inseminations. The altered endocrine activity compromises follicular and corpora luteal development, reduces oocyte quality and increases embryo mortality. This paper reviews current knowledge on the metabolic and endocrine mechanisms associated with seasonal infertility in gilts and sows and describes some pharmacological approaches that can be utilized to counter this infertility.
在母猪和母猪中，夏秋季通常表现为生育力下降。热应激和温暖季节的长光照周期会导致采食量减少和下丘脑-垂体-卵巢轴失衡。发情开始和排卵之间的间隔增加，导致配种时间不佳的次数增加。内分泌活动的改变会损害卵泡和黄体的发育，降低卵母细胞质量并增加胚胎死亡率。本文综述了与母猪季节性不育相关的代谢和内分泌机制的最新知识，并描述了一些可用于对抗这种不育的药理学方法。
