Animal Husbandry and Feed Science ›› 2019, Vol. 40 ›› Issue (11): 57-60.doi: 10.12160/j.issn.1672-5190.2019.11.014

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Research Progress on Ovulation Promoted by hCG in Equus Animals

WU Hai-qing, Sachula, SU Shao-feng, ZHAO Jun-li, LIU Yong-bin, LI Yu-rong   

  1. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China
  • Received:2019-09-17 Online:2019-11-30 Published:2019-12-19

Abstract: Equus are seasonal single-born animals. The duration from the estrous appearance to ovulation lasts for 3 to 13 days in mares or jennets. This physiological characteristic greatly affects their reproductive rate. hCG, as a LH analogue, is widely used in the study of follicular development and ovulation in Equus animals, which is not regulated by sex hormones feedback mechanism. This paper reviews the research progress on ovulation promoted by hCG in Equus animals from the following five aspects: the role of sex hormones in mammalian follicular development, main follicular wave and the ovulation of the dominant follicle induced by LH in Equus animals, the impacts of exogenous hormone on follicular development in Equus animals, structure and function of hCG, the application of hCG in prolonging the luteal phase in mares and in superovulation in Equus animals.

Key words: Equus animals, ovulation, hCG, prolonged luteal phase, superovulation

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