放牧强度和放牧时间对牦牛干物质采食量及其表观消化率的影响  

Effects of Grazing Intensity and Time on Dry Matter Intake and its Apparent Digestibility of Yaks

作　　者：董全民[1] 赵新全[2] 

机构地区：[1]青海省畜牧兽医科学院,西宁810016 [2]中国科学院西北高原生物研究所,西宁810001

出　　处：《中国草食动物》2007年第5期12-14,共3页China Herbivores

基　　金：国家"十五"科技攻关计划重大项目(2001BA606A-02);2005年度青海三江源自然保护区生态保护和建设总体规划科研课题及应用推广招标项目(2005-SN-1);国家"十一五"科技支撑计划重大项目(2006BAC01A-02)

摘　　要：垂穗披碱草/星星草混播草地3个放牧季节的牦牛放牧试验结果表明:放牧强度和放牧时间对牦牛采食量均有极显著的影响(P<0.01),在放牧期内,牦牛干物质的采食量随放牧强度的增加而减小,而且随放牧时间的延续,各放牧区牦牛的干物质采食量均在8月5-20日达到最大;放牧强度对牦牛粪干物质的影响极显著(P<0.01),而放牧时间(季节变化)对它的影响不显著(P>0.05);极轻度和轻度放牧区牦牛干物质的消化率均在7月20日-8月5日达到最大,而中度和重度放牧区均在8月20日-9月5日达到最大。The result of grazing trial of three grazing seasons in mixed-sown grassland of Elymus natans / Puccinellia tenu flora showed： effects of grazing intensity and time on dry matter intake of yaks were extremely significant （P〈0.01）, and during grazing, dry matter intake of yaks decreased with the increase of grazing intensity, and then dry matter intake of yaks for every grazing plot was maximized during the 5th to 20th of August; there were extremely significant effects of grazing intensity on dry feaces of yak （P〈0.01）, but effects of grazing time on them were not significant （P〉0.05） ; moreover, dry matter digestibility of yaks was maximized during the 20th of July to 5th of August in extremely light and light grazing plot, but in moderate and heavy grazing plot it was maximum during the 20th of August to 5th of September.

关 键 词：放牧强度 牦牛 干物质采食量 表观消化率 

分 类 号：S823.43[农业科学—畜牧学]