Effect of dose of GnRH analog on ovulation in mares

摘要: Abstract Proper timing of insemination for optimal conception is accomplished by frequent palpations per rectum, ultrasonography the preovulatory follicle and/or treatment with hCG or GnRH. Sustained release GnRH from implants has been shown to hasten ovulation. Therefore, 2 studies were conducted evaluate efficacy a analog, deslorelin, hastening ovulation in nonlactating cyclic mares. The implant was 2.3 × 3.7 mm and released deslorelin 3 days. In Experiment 1, 60 nonlactating, cycling mares assigned 1 5 doses: 0, 1.2, 1.7, 2.2 2.7 mg implant. Mares sequentially on first day estrus (Day 1). Ovaries examined rectum every 12 h until Once obtained >30 mm, they injected subcutaneously inseminated other during semen stallions. Pregnancy determined ultrasonography. 2, 40 treatments (same as Data interval ovulation, duration pregnancy rates at 12, 18 35 d after Time shorter (P