title: Response of gilts with delayed puberty to pregnant mare serum gonadotropin or estrogen.
abstract: The effect of pregnant mare serum gonadotropin (PMSG) or estradiol cyclopentylpropionate (EC) on the induction of estrus, duration of estrus, and serum progesterone concentration after estrus was evaluated in 8 gilts with delayed puberty. Four gilts were given 500 IU of PMSG IM and 4 were given 2 mg of EC, IM. The inactive status of the ovaries at the time of treatment was verified by serum progesterone values of less than 0.5 ng/ml in serial samples collected before treatment. The 4 EC-treated gilts came into estrus at a mean of 3.5 days after treatment, but 1 of the gilts did not form corpora lutea. Three PMSG-treated gilts came into estrus at a mean of 4.0 days after treatment. The remaining PMSG-treated gilt remained anestrus and did not form corpora lutea. The mean duration of estrus in EC-treated gilts was 5.25 days compared with 2.0 days for PMSG-treated gilts (P less than 0.05). Serum progesterone concentrations were higher in PMSG-treated gilts than in EC-treated gilts at 8, 11, and 17 days after treatment (P less than 0.05).
mesh_terms: D000818:Animals; D003338:Corpus Luteum / Q000254:growth & development; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D004971:Estrus; D005260:Female; D006064:Gonadotropins, Equine / Q000494:pharmacology*; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D012741:Sexual Maturation / Q000187:drug effects*; D013552:Swine / Q000502:physiology*
chemical_list: D006064:Gonadotropins, Equine; D011374:Progesterone; D004958:Estradiol; C007630:estradiol 17 beta-cypionate