Khaiseb P Clemens, Hawken Penelope A R, Martin Graeme B
UWA School of Agriculture and Environment, The University of Western Australia, Perth 6009, Australia.
UWA Institute of Agriculture, The University of Western Australia, Perth 6009, Australia.
Animals (Basel). 2022 Feb 2;12(3):362. doi: 10.3390/ani12030362.
We tested whether short-term nutritional supplementation (500 g lupin grain per head daily) would affect the response of ewes to the ram effect. Experiment 1 (end of non-breeding season): ewes were supplemented for either Days -6 to -1 relative to ram introduction ( 24) or for 12 days after ram introduction (Days 11 to 22 of the ram-induced cycle; 29). Controls ( 30) were not supplemented. Across all groups, 94-100% of ewes ovulated. Supplementation before ram introduction did not affect ovulation rate at the ram-induced ovulation but increased it during the ram-induced cycle (Control 1.37; supplemented 1.66; < 0.05). Experiment 2 (the middle of non-breeding season): the supplement was fed for Days -5 to -1 relative to ram introduction. Again, supplementation did not increase number ovulating (Control 16/29; Supplemented 10/29) but it did increase ovulation rate at the ram-induced ovulation (Control 1.31; Supplemented 1.68; < 0.05). In neither experiment did supplementation affect the frequency of short cycles. Supplementation before ram introduction did not improve the percentage of ewes ovulating or reduce the frequency of short cycles (so will not improve the synchrony of lambing). However, supplementation after ram introduction can increase prolificacy.
我们测试了短期营养补充（每头每天500克羽扇豆谷物）是否会影响母羊对公羊效应的反应。实验1（非繁殖季节末）：在引入公羊前的第6至1天（24只）或引入公羊后的12天（公羊诱导周期的第11至22天；29只）对母羊进行补充。对照组（30只）不进行补充。在所有组中，94% - 100%的母羊排卵。在引入公羊前进行补充对公羊诱导排卵时的排卵率没有影响，但在公羊诱导周期中排卵率增加了（对照组为1.37；补充组为1.66；P < 0.05）。实验2（非繁殖季节中期）：在引入公羊前的第5至1天进行补充。补充并没有增加排卵母羊的数量（对照组16/29；补充组10/29），但增加了公羊诱导排卵时的排卵率（对照组为1.31；补充组为1.68；P < 0.05）。在两个实验中，补充都没有影响短周期的频率。在引入公羊前进行补充并没有提高排卵母羊的百分比或降低短周期的频率（因此不会提高产羔的同步性）。然而，在引入公羊后进行补充可以提高繁殖力。
