Failure of Gonadotropin Therapy to Induce Estrus in Gilts Treated with a GnRH Analog to Suppress Ovarian Activity
نویسنده
چکیده
A study was conducted to determine whether treatment with deslorelin, a gonadotropin-releasing hormone (GnRH) analog, produced anestrus in gilts and to test the ability of exogenous gonadotropin treatment with a combination of 400 IU equine chorionic gonadotropin and 200 IU human chorionic gonadotropin to induce estrus in GnRH analog-treated gilts. Twelve days after the third estrus, 11 gilts each received a full SC implant containing 2.1 mg deslorelin, a half implant containing 1.05 mg deslorelin, or a sham implant. The implants remained in place for the duration of the study. Approximately 23 days after placement of implants, GnRH analog-treated gilts that had not returned to estrus (n = 18) received IM injections of either 400 IU equine chorionic gonadotropin and 200 IU human chorionic gonadotropin or deionized water. The percentage of gilts with 3to 4-
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Ovarian response to pregnant mare serum gonadotropin and porcine pituitary extract in gilts actively immunized against gonadotropin releasing hormone.
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