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Hormones involved in estrus cycle, foaling during, and after birth

The cycle is controlled by several hormones that regulate the estrous cycle, the Sea issue, and the reproductive system of the sea. The cycle begins when the increase in day length causes the pineal gland to reduce levels of melatonin, thereby allowing the hypothalamus to secrete GnRH.
GnRH (gonadotropin releasing hormone): secreted by the hypothalamus, pituitary due to the release of gonadotropins 2: LH and FSH.
LH (Luteinizing hormone) levels are higher in 2 days after ovulation, then decrease slowly over 4-5 days, dipping the lowest levels of 5-16 days after ovulation. To stimulate the follicle to develop, which in turn causes an increase in estrogen. Unlike most mammals, the sea has increased by LH right before ovulation.
FSH (Follicle-stimulating hormone): secreted by the pituitary, causes the ovarian follicle to develop. FSH levels rise slightly at the end of inspiration, but they have their highest peak about 10 days before the next ovulation. FSH is inhibited by inhibin (see below), while the levels of LH and place estrogen, which prevents immature follicles to continue their growth.
Estrogeni: secreted by the follicle developing, which causes the pituitary gland to secrete more LH (hence, these 2 hormones are in a positive feedback loop). Moreover, causes behavioral changes in the sea, making its most recpetive towards the stallion, and causes physical changes in the cervix, uterus, vagina and prepare the mare for the conception (see above). Estrogeni peaks 1-2 days before ovulation, and reduce within 2 days after ovulation.
Inhibin: secreted by the follicle developed right before ovulation, "turns off" FSH, which is no longer necessary now that the follicle is greater.
Progesterone: prevents conception and decreases sexual receptibility sea to stallion. Progesterone is lowest during estrus, and increases during diestrus. It decreased by 15 days after ovulation, when the corpora lutea begns to diminish in size.
Prostaglandine: secreted by endrometrium 13-15 days after ovulation Cases luteolysis and prevents the body from luteum secreting progesterone
ECG (equine chorionic gonadotropin - formerly called PMS / PMSG pregnant mare serum and pregnant mare serum gonadotropin): chorionic gonadotrophin secreted if the sea conceives. First secreted by the endometrial cups around the 36th day of gestation, with a maximum of about 60 days, and declining after about 120 days of gestation. Also helping to stimulate the growth of the fetus gonads.
Prolactin: stimulates feeding
Ossitocina: stimulates the uterus to contract
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