Santos I W, Binsfeld L C, Weiss R R, Kozicki L E
Animal Reproduction, Faculty of Veterinary Medicine, Federal University of Paraná State, Palotina, Brazil.
Vet Med Int. 2010 Sep 28;2010:978520. doi: 10.4061/2010/978520.
The aim of the present paper was to investigate the efficiency of the equine chorionic gonadotropin (eCG) plus human chorionic gonadotropin (hCG) associated with medroxyprogesterone acetate (MAP) to estrous ewes synchronization. Ninety Texel ewes were investigated during seasonal anoestrous. The ewes received intravaginal sponges containing MAP (60 mg) for nine days. At the time of sponges' withdrawal, the ewes were divided into three groups (G): (1) receiving 2 mL of saline i.m. (n = 30), (2) receiving eCG 400 IU i.m. (n = 30), and (3) receiving eCG 400 IU plus hCG 200 IU i.m. (n = 30). Twelve h after sponges' removal, teaser rams were used to estrus check and remained with the ewes for 96 h. The artificial insemination was made with fresh semen 10 h after estrus detection. The effect of the treatment was not significant for the estrous rates among the groups: 73%, 90%, and 86%, respectively. The main effect was observed in the pregnancy and lambing rates among the groups: 70%, 86%, 56%, and 80%, 120%, 56%, respectively. Based on these results from our study, the use of the MAP-eCG is the best choice to improve the fertility rate on ewes.
本文旨在研究马绒毛膜促性腺激素（eCG）加人绒毛膜促性腺激素（hCG）联合醋酸甲羟孕酮（MAP）对发情母羊进行同期发情的效果。在季节性乏情期对90只特克塞尔母羊进行了研究。母羊阴道内置入含MAP（60毫克）的海绵栓，持续9天。在取出海绵栓时，将母羊分为三组（G）：（1）肌肉注射2毫升生理盐水（n = 30），（2）肌肉注射400国际单位eCG（n = 30），（3）肌肉注射400国际单位eCG加200国际单位hCG（n = 30）。取出海绵栓12小时后，用试情公羊检查发情情况，并与母羊相处96小时。在发情检测后10小时，用新鲜精液进行人工授精。各组之间的发情率差异不显著：分别为73%、90%和86%。主要影响体现在各组的妊娠率和产羔率上：分别为70%、86%、56%和80%、120%、56%。根据我们研究的这些结果，MAP-eCG的使用是提高母羊繁殖率的最佳选择。
