4种粗饲料经纤维素酶发酵后产物的瘤胃降解特性研究OA北大核心CSTPCD

The purpose of the experiment was to study the degradation characteristics of the products of four roughage feeds,sugarcane tail leaves,corn stalks,elephant grass and cassava branch,fermented by cellulase(CE)in buffalo rumen,so as to provide a reference for the selection and utilization of roughage in buffalo breeding.Three buffaloes with permanent rumen fistula were used as experimental animals.Nylon bag method was used to determine the nutritional components and rumen degradation characteristics of four kinds of roughage and their products after CE fermentation.The results showed that before fermentation,the content of crude protein(CP)in sugarcane tail leaves and elephant grass was significantly higher than that in corn stalks and cassava branch(P＜0.05).The content of neutral detergent fiber(NDF)in cassava branch was the lowest(P＜0.05),and the content of acid detergent fiber(ADF)was the highest(P＜0.05).After CE treatment,the content of CP in fermentation group increased in different degrees,while the content of NDF and ADF decreased in different degrees.Before fermentation,the effective degradation rates of all nutrients were as follows:Elephant grass＞sugarcane tail leaf＞corn stalk＞cassava branch.The effective degradation rates of DM,NDF,and ADF of elephant grass were significantly higher than those of other groups(P＜0.05),the effective degradation rates of CP of elephant grass were significantly higher than those of corn stalk and cassava branch(P＜0.05),and the effective degradation rates of nutrients of cassava branch were significantly lower than those of other groups(P＜0.05).After CE treatment,compared with the control group,the effective degradation rates of DM,CP,NDF,and ADF in the fermentation group were improved to varying degrees.The study indicates that the feed value of the four kinds of roughage is as follows:Elephant grass＞sugarcane tail leaf＞corn straw＞cassava branch.Adding CE can improve the rumen degradation rate of the four kinds of roughage.