牧归后补饲精料对冷季藏系绵羊生长性能的影响
Effect of Concentrate Supplementing after Grazing on Growth Performance of Tibetan Sheep in Alpine Pastoral Area during Cold Season

为揭示冷季牧归后补饲精料对藏系绵羊生长性能的影响，选取60只体况相近的3岁藏系绵羊（公母各半）随机分成单一放牧组和归牧补饲组，每组公、母羊各15只。单一放牧组羊只采用冷季单一放牧，牧归补饲组羊只采用与放牧组相同的放牧活动，并在牧归后按每只150 g·d-1的饲喂量补饲某品牌精料补充料，为期70 d。结果表明，牧归后补饲精料极显著提高藏系绵羊的前期增量、前期日均增量、后期增量、后期日均增量、全期增量、全期日均增量、增量比例和冷季养殖净收益。牧归补料组公羊的全期增量和增量比例优于母羊，但不同性别羊只对冷季养殖净收益差异不显著。因此，牧归后补饲精料可以提高高寒牧区藏系绵羊冷季增量和养殖收益。
In order to reveal the effect of concentrate supplementing after grazing on growth performance of Tibetan sheep during cold season,60 Tibetan sheep (30 male and 30 female,3-year-old) with familiar body conditions were divided to two groups: traditional grazing group (male 15,female 15) and supplementing group (male 15 and female 15). During the experimental period of 70 days,sheep in grazing group were fed with traditional grazing model,each sheep in supplementing group was fed 150 g·d-1 of concentrate feed after grazing. Results showed that concentrate supplementing after grazing significantly increased earlier mass gain,earlier average daily mass -gain,later mass gain,later average daily mass gain,total mass gain,total average daily mass gain,gain rate and economic benefit of sheep breeding. The total mass gain and gain rate of male sheep in supplementing group was better than female sheep,sex factors had no effect on net economic benefit of sheep breeding during the experiment. In conclusion,concentrate supplementing after grazing is a feasible method to increase mass gain in sheep and pastoralists’ economic benefit in alpine pastoral area during cold season.