草地牧草在放牧绵羊体内消化吸收的动态特征  

Dynamic Characteristics of Forage Digested and Absorbed by Sheep.

作　　者：王钦[1] 肖金玉[1] 王天玲 李峻成[1] 

机构地区：[1]兰州大学草地农业科技学院 [2]甘肃省定西地区卫校,甘肃定西743000

出　　处：《中国草地》2002年第5期10-14,共5页Grassland of China

基　　金：国家自然科学基金重点项目 (396 30 2 5 0 );甘肃省攻关配套项目 (GK971- 2 - 34A)共同资助

摘　　要：在牧草量适中或在牧草丰富的草地放牧 ,绵羊可依其嗜好随意选择采食 ,其食物营养和干物质消化率均高于草地牧草的量。在这种情况下各放牧季中绵羊消化道各部位食糜中DM、GE流通量呈递减的趋势 ,干物质的消化主要在胃区 ,CP的消化则是以肠为最高 ,它的消化量占消化道消化总量的比率秋季是 77.4 9% ,冬季是 5 3.15 % ,夏季是 74 .19% ;小肠吸收的蛋白质量秋季是7.35 g/kgW0 .75,冬季是 3.91g/kgW0 .75,夏季是 13.0 6 g/kgW0 .75;消化道中消化吸收的CP量则依次是 9.5 3g/kgW0 .75、4 .78g/kgW0 .75和 18.0 4 g/kgW0 .75;而瘤胃液中氨氮的含量秋季是 2 5 .5 8mg/ 10 0ml,冬季是 2 1.76mg/ 10 0ml,夏季是 37.6 3mg/ 10 0ml。Sheep wes grazed freely on grassland with abundant or moderate grasses, which taken in by sheep had better nutiition and higher digestibility than that remained on the land, and in that condition, the flow of DM and GE were gradually decreased from rumen to small intestine during the grazing season.Morst of DM was digested in the rumem and CP was ainly digested in the small intestine.CP digetibility was 77.49% ,the tract digetibility is 53.15% in winter and 74.19% in summer.7.35 g/kgW 0.75 CP was absorbed by small intesine,3.91 g/kgW 0.75 in winter and 13.06 g/kgW 0.75 in Summer,in the whole digestive tract,the NH 3-N of the rumen fluid was 25.58/100ml in autumn,21.76mg/100ml in winter and 37.63mg/100ml in summer.

关 键 词：草地牧草 放牧绵羊 体内消化吸收 动态特征 

分 类 号：S812.8[农业科学—草业科学] S826.1[农业科学—畜牧学]