Rumen Degradation Regularity of Dry Matter and Crude Protein of Common Roughage in Beef Cattle

摘要

Three individuals of Horqin yellow cattle equipped with permanent fistula,weighed( 548 ± 21) kg,were selected as the experimental animals. The rumen degradation characteristics of dry matter( DM) and crude protein( CP) of roughage at 6,12,24,48 and 72 h were measured by nylon bag method. The results showed that the effective degradation rates of DM and CP of alfalfa hay were the highest,while higher contents of rapid degradation part and potential degradation part of DM and CP also resulted in higher degradation rates of DM and CP. The effective degradation rates of CP and DM of roughage presented strong positive correlation with CP,but showed strong negative correlation with neutral detergent fiber( NDF). The effective degradation rates of CP of five roughages successively were alfalfa hay > alfalfa block > ryegrass > silage corn > straw.