Publicación: Fisiología del ciclo estral de la yegua
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The physiology of the estral cycle of the female equine is influenced by management conditions, nutrition, age, environmental conditions, among others. These factors can affect the mare's reproductive future. Research on the estrous cycle in mares are focused mainly in areas where there are stations, but not in the tropics as in our case, in the circadian cycle has been affected by photoperiod behaves as seasonal poliestrous. The success in reproduction is based on different aspects such as race, body condition, nutrition, management, photoperiod, genital tract development, among others. By means of studies on the physiology of the cycle and the mechanisms to improve the same time we have carried out an equitable reproduction in the different environmental conditions. The cycle is ranked time between ovulation and another, in mares spoke 19 to about 21 days, which is composed of a follicular phase of 5-7 days and a luteal of 14 to 16 days, starting with follicular phase where we have the participation of the hormones GnRH, FSH and LH. In the luteal phase, the hormones progesterone, prostaglandin F2α and a low level of FSH participate; in it the uterus will be prepared for the implantation of an oocyte and carry out a future gestation or initial the estrous cycle again. The presence in its reproductive phase is very demanding in a relationship of light hours, fortunately Colombia is a tropical country where we witness 12 light hours 365 days a year, and we have a constant cycle of estrus in mares.