Tritschler J P, Duby R T, Parsons E M, Parsons M J, Giordano D J
Department of Veterinary and Animal Sciences, Animal Physiology and Integrated Parasite Control Group, University of Massachusetts, Amherst, MA 01003, USA.
Theriogenology. 1991 May;35(5):943-52. doi: 10.1016/0093-691x(91)90305-w.
A comparison was made of the relative effectiveness of subcutaneous ear implants containing 2 mg Norgestomet or vaginal pessaries containing 60 mg medroxyprogesterone acetate (MAP) to induce estrus and conception in dry anestrous ewes. Groups of ewes were treated with one of the two progestogens for 14 d, and 500 IU pregnant mare serum gonadotropin (PMSG) was administered intramuscularly at the time of progestogen withdrawal. No significant differences in estrus induction, pregnancy rate or number of lambs born per ewe lambing were observed. Ewes treated with Norgestomet had 96% estrus, 60% pregnancy rate and 1.4 lambs per ewe lambing. Comparably, ewes treated with MAP had 94% estrus, 65% pregnancy rate and 1.7 lambs per ewe lambing. Norgestomet implants compared favorably with MAP pessaries for estrus induction and breeding of commercial, dry anestrous ewes.
对含2毫克诺孕美特的皮下耳部植入物或含60毫克醋酸甲羟孕酮（MAP）的阴道栓诱导乏情母羊发情和受孕的相对有效性进行了比较。将母羊分组，用两种孕激素之一处理14天，并在停用孕激素时肌肉注射500国际单位孕马血清促性腺激素（PMSG）。在发情诱导、妊娠率或每只产羔母羊所产羔羊数量方面未观察到显著差异。用诺孕美特处理的母羊发情率为96%，妊娠率为60%，每只产羔母羊产1.4只羔羊。相比之下，用MAP处理的母羊发情率为94%，妊娠率为65%，每只产羔母羊产1.7只羔羊。在诱导商业乏情母羊发情和繁殖方面，诺孕美特植入物与MAP阴道栓相比效果良好。
