饲粮蛋白质水平对重庆黑山羊消化代谢的影响

以5月龄左右重庆黑山羊为试验动物,配制了粗蛋白质水平分别为8.23%、10.42%和12.52%的饲粮,进行了消化代谢试验和瘤胃降解试验。结果表明:随着饲粮中粗蛋白质水平的提高,各组间的干物质消化率、粗蛋白质消化率、氮沉积率、中性洗涤纤维消化率、酸性洗涤纤维消化率、粗纤维消化率之间的差异均不显著(P>0.05)。随着饲粮中粗蛋白质水平的提高,瘤胃内中性洗涤纤维的降解率在各个时间点变化不明显(P>0.05);酸性洗涤纤维的降解率在6h及以前降低(P<0.05),之后接近;干物质的降解率在6h及以前提高(P<0.05),之后接近;有机物的降解率在6h提高(P<0.05),之后接近;粗蛋白质降解率在12h及以前提高(P<0.05),之后接近。

Effects of Dietary Protein Levels on Digestion and Metabolism for Chongqing Black Goat

In the study,diets of different crude protein levels(8.23%,10.42% and 12.52%) were compounded.The digestion and metabolism experiments and the rumen degradation test were carried on for 5 months Chongqing black goat.The results showed that ① With the increase of crude protein level,there was no significant difference among of the digestibility rate of the dry matter,crude protein,nitrogen,NDF,ADF and CF(P > 0.05).②With the increase of crude protein level,the rumen degradation rate of NDF wasn't obviously changed in each time spot(P > 0.05);there was a decrease in rumen degradation rate of ADF within 6 hours(P < 0.05),and afterwards they became closer;the rumen degradation rate of dry matter was increased within 6 hours(P < 0.05),and afterwards they became closer;there was a increase in rumen degradation rate of organic matter at 6th hour(P < 0.05),and afterwards they became closer;the rumen degradation rate of crude protein was increased within 12 hours(P < 0.05),and afterwards they became closer.