Cystorelin is indicated for the treatment of ovarian follicular cysts in dairy cattle. Ovarian cysts are non-ovulated follicles with incomplete luteinization which result in nymphomania or irregular estrus. Historically, cystic ovaries have responded to an exogenous source of LH such as human chorionic gonadotrophin.
Cystorelin initiates release of endogenous LH to cause ovulation and luteinization. Cystorelin is also indicated for use with cloprostenol sodium to synchronize estrous cycle to allow for fixed time artificial insemination (FTAI) in lactating dairy cows and beef cows. Endogenous gonadorelin is synthesized and/or released from the hypothalamus during various stages of the bovine estrus cycle following appropriate neurogenic stimuli. It passes via the hypophyseal portal vessels, to the anterior pituitary to effect the release of gonadotropins.
Synthetic gonadorelin administered intravenously or intramuscularly also causes the release of endogenous LH or FSH
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