中文摘要：

本试验对西藏57种栽培牧草氨基酸总量、必需氨基酸、含硫氨基酸以及限制性氨基酸的组成特点进行了分析。结果表明,牧草中氨基酸总量为6.11%～23.71%,各科牧草氨基酸总量顺序是豆科〉藜科〉禾本科。其中必需氨基酸含量平均为6.42%,必需氨基酸含量占氨基酸总量比值最高的是豆科牧草,最低的则是禾本科牧草;含硫氨基酸含量为0.44%～1.63%,不同品种间差异较大;牧草限制性氨基酸含量较高,为0.63%～2.25%。同时满足EAA/NEAA〉60%,EAA/TAA〉40%的牧草共有47种,占栽培牧草总数的82%。研究表明西藏栽培牧草氨基酸组成合理,营养价值较高,是当地家畜优质的饲草来源。

英文摘要：

The characteristics of total amino acid（TAA）,essential amino acids（EAA）,sulfur amino acid,and limited amino acid of 57 cultivated forages in Tibet were studied.The TAA content ranged from 6.11% to 23.71% and declined in the sequence Leguminosae〉Chenopodiaceae〉Gramineae.The average content of EAA was 6.42% and the highest and the lowest ratios of EAA to TAA content were in the Leguminosae and Gramineae,respectively.The sulfur amino acid content ranged from 0.44% to 1.63%,and varied greatly between species.There was also a high ratio of limited amino acid content,which ranged from 0.63% to 2.25%. There were 47species,accounting for 82% of all the forages,with ratios of EAA/NEAA〉60% and of EAA/ TAA〉40%.This showed that there was a reasonable constitutive ratio of amino acid and high nutritive value in the cultivated forages,which were therefore excellent feed resources for local livestock.