Nottle M B, Kleemann D O, Grosser T I, Seamark R F
Department of Obstetrics and Gynaecology, Medical School University of Adelaide, Australia.
Anim Reprod Sci. 1997 Jul;47(4):255-61. doi: 10.1016/s0378-4320(97)00025-0.
A nutritional strategy for increasing ovulation rate in Merino ewes mated in late spring-early summer was evaluated on two commercial farms. The strategy used the 'ram effect' to induce oestrus in seasonally anoestrus ewes and supplementary feeding of lupin grain six days prior to oestrus to increase ovulation rate. Ewes that had been isolated from rams for 6 weeks were exposed to vasectomised rams for 2 weeks and then mated to fertile rams for 6 weeks. Feeding 500 g lupins/head/day for 14 days commencing 12 days after the introduction of vasectomised rams, increased the number of ovulations from 126 to 146 per 100 ewes exposed to rams (P < 0.05). This increase was reflected in an improvement in fecundity (lambs born per ewe lambing; P < 0.05) but not fertility (ewes lambing per ewe mated to rams). Net reproductive performance (the product of fertility, fecundity and lamb survival) was increased by 11 lambs weaned per 100 ewes exposed to rams due to lupin supplementation at mating.
在两个商业农场对一种提高晚春至初夏配种的美利奴母羊排卵率的营养策略进行了评估。该策略利用“公羊效应”诱导季节性乏情母羊发情，并在发情前6天补充羽扇豆谷物以提高排卵率。将与公羊隔离6周的母羊与输精管结扎公羊接触2周，然后与可育公羊交配6周。从引入输精管结扎公羊12天后开始，每头母羊每天饲喂500克羽扇豆，持续14天，每100头接触公羊的母羊排卵数从126个增加到146个（P<0.05）。这种增加反映在繁殖力（每只产羔母羊产羔数；P<0.05）的提高上，但未反映在受胎率（与公羊交配的母羊中产羔的母羊数）上。由于配种时补充羽扇豆，每100头接触公羊的母羊断奶羔羊数增加了11只，净繁殖性能（受胎率、繁殖力和羔羊存活率的乘积）得到提高。
