Awel Hayatu, Eshetu Lisanework, Tadesse Gebrehiwot, Birhanu Alemselam, Khar S K
Faculty of Veterinary Sciences, Mekelle University, P.O. Box: 231, Mekelle, Ethiopia.
Trop Anim Health Prod. 2009 Oct;41(7):1521-4. doi: 10.1007/s11250-009-9342-7. Epub 2009 Apr 4.
Sixteen female sheep of Degua breed were assigned to receive either the full dose of norgestomet ear implant and injectable solution containing norgestomet and estradiol valerate (n = 8) or half the dose (n = 8). The ear implants were removed in both groups on day 12. All ewes received an intramuscular administration of 500 IU PMSG at implant withdrawal. Synchronized ewes were individually hand mated twice at 48 and 60 hours after implant removal. One ewe in each group however refused mating on both occasions. Pregnancy diagnosis was conducted by bimanual external palpation 90 to 100 days post mating. The conception rates (3/7, 42.85%) and (5/7, 71.42%) were recorded in the two treatment groups, respectively. All eight ewes lambed between 145 to 153 days post mating. In group I ewes carried only singletons (prolificity rate 1.0) whereas in group II two ewes delivered twins, producing 7 lambs with prolificity rate of 1.4 (N.S). From this preliminary investigation it appears that the lower dose of norgestomet ear implants offers better option for estrus synchronization accompanied by higher fertility.
将16只德瓜品种的母羊分为两组，一组接受全剂量的诺孕美特耳部植入剂以及含有诺孕美特和戊酸雌二醇的注射溶液（n = 8），另一组接受半剂量（n = 8）。两组的耳部植入剂均在第12天取出。所有母羊在取出植入剂时肌肉注射500国际单位的孕马血清促性腺激素。同步发情的母羊在取出植入剂后的48小时和60小时分别进行两次人工配种。然而，每组中有一只母羊在这两次配种时均拒绝交配。在配种后90至100天通过双手外部触诊进行妊娠诊断。两个治疗组的受孕率分别为（3/7，42.85%）和（5/7，71.42%）。所有8只母羊在配种后145至153天产羔。第一组母羊只产单羔（繁殖率为1.0），而第二组有两只母羊产双羔，共产7只羔羊，繁殖率为1.4（无显著差异）。从这项初步研究来看，较低剂量的诺孕美特耳部植入剂似乎为发情同步提供了更好的选择，且生育力更高。
