Colazo Marcos G, Mapletoft Reuben J
Livestock Research Branch, Alberta Agriculture and Forestry, Edmonton, Alberta T6H 5T6 (Colazo); Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5B4 (Mapletoft).
Can Vet J. 2017 Apr;58(4):365-370.
This study compared pregnancy per AI (P/AI) of heifers inseminated with sex-selected or conventional semen after estrus detection (ED) or timed-AI (TAI). Heifers in the ED group received 2 treatments with prostaglandin F2α 14 d apart and those in the TAI group received a modified 5-day Co-synch protocol plus an intravaginal progesterone releasing insert device (PRID) and were inseminated 72 h after PRID removal. Overall P/AI were 69.2% (74/107) and 64.1% (75/117) for conventional and sex-selected semen ( > 0.05). Although P/AI in ED heifers following the use of conventional semen were numerically higher (75.0% 63.6%), P/AI with sex-selected semen were almost identical (65.0% 63.2%) for ED and TAI heifers. Pregnancy losses from first pregnancy diagnosis to term did not differ between ED and TAI heifers (6.0% 11.3%). In summary, heifers subjected to TAI with sex-selected semen following the application of a modified 5-day Co-synch plus PRID protocol had acceptable P/AI.
本研究比较了在发情检测（ED）或定时输精（TAI）后，用性别选择精液或常规精液输精的小母牛的每人工授精妊娠率（P/AI）。ED组的小母牛每隔14天接受两次前列腺素F2α治疗，TAI组的小母牛接受改良的5天同期发情方案加阴道内孕酮释放装置（PRID），并在取出PRID后72小时进行输精。常规精液和性别选择精液的总体P/AI分别为69.2%（74/107）和64.1%（75/117）（>0.05）。虽然使用常规精液的ED小母牛的P/AI在数值上较高（75.0%对63.6%），但ED和TAI小母牛使用性别选择精液的P/AI几乎相同（65.0%对63.2%）。从首次妊娠诊断到足月的妊娠损失在ED和TAI小母牛之间没有差异（6.0%对11.3%）。总之，在应用改良的5天同期发情加PRID方案后，用性别选择精液进行TAI的小母牛具有可接受的P/AI。
