为研究云南黄牛对不同牧草的降解特性，采用尼龙袋法评定了6种牧草的干物质（DM）、有机物（OM）、粗蛋白质（CP）、中性洗涤纤维（NDF）和酸性洗涤纤维（ADF）瘤胃动态消失率和有效降解率。结果表明：6种牧草DM的72 h消失率和有效降解率为苜蓿草粉最高，与一年生黑麦草粉相近（P>0.05），并与依次降低的苜蓿草块、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉之间差异极显著（P<0.01）；6种牧草OM的72 h消失率和有效降解率与DM有相同的趋势；6种牧草CP的72 h消失率和有效降解率为苜蓿草粉最高，并与依次降低的苜蓿草块、一年生黑麦草粉、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉之间差异极显著（P<0.01）；6种牧草NDF和ADF的72 h消失率为苜蓿草粉最高，并与依次降低的苜蓿草块、一年生黑麦草粉、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉之间差异极显著（P<0.01）；6种牧草NDF和ADF的有效降解率为苜蓿草粉最高，与苜蓿草块相近（P>0.05），并与依次降低的一年生黑麦草粉、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉之间差异极显著（P<0.01）。因此，从云南黄牛对6种牧草的消化效果看，苜蓿草粉的营养价值最高，非洲狗尾草粉的营养价值最低。

In order to study the degradation characteristics of different types of forages in Yunan yellow cattles, nylon-bag technique was used to evaluate the disappearance rates and effective degradabilities of dry matter （DM）, organic matter （OM）, crude protein （CP）, neutral detergent fiber （NDF） and acid detergent fiber (ADF) of six types of forages. The results showed as follows: DM disappearance rate and effective degradability of alfalfa powder were the highest at 72 h among six types of forages, and closed to those of annual ryegrass powder (P>0.05), but significantly higher than those of alfalfa block, Vicia atropurpurea powder, barley straw powder, and Setaria powder （in descending order） (P<0.01); OM disappearance rate and effective degradability had the same trend with DM at 72 h; CP disappearance rate and effective degradability of alfalfa powder at 72 h were the highest among six types of forages, and significantly higher than those of alfalfa block, annual ryegrass powder, Vicia atropurpurea powder, barley straw powder, and Setaria powder （in descending order） (P<0.01); disappearance rates of NDF and ADF of alfalfa powder at 72 h were the highest among types of forages, and significantly higher than those of alfalfa block, annual ryegrass powder, Vicia atropurpurea powder, barley straw powder, and Setaria powder （in descending order） (P<0.01); effective degradabilities of NDF and ADF of alfalfa powder were the highest among types of forages，and closed to alfalfa block (P>0.05), but significantly higher than those of annual ryegrass powder, Vicia atropurpurea powder, barley straw powder, and Setaria powder （in descending order） (P<0.01). For Yunnan yellow cattles, alfalfa powder has the highest nutritional value, while the Setaria powder has the lowest nutritional value among the six types of testing forages.［Chinese Journal of Animal Nutrition，2011，23（1）：53-60］