Study On Degradation Pattern Of The Commonly Used Forage In The Rumen Of Dairy Cow

3 Chinese Holstein dairy cows in lactation anaphase, equipped with rumen fistulae, average 500 kg were used in this experiment. The degradation pattern of Crude protein (CP), Acid detergent fiber (ADF), neutral detergent fiber (NDF) and dry matter(DM) in different stubbles of Alfalfa hay, different types of maize, leymus chinensis and aspartate in the rumen of dairy cows were investigated by the nylon bag technique. By studying systematically the degradation pattern of DM, CP, NDF, ADF and other major nutrient components of different forage in the rumen of dairy cows, these provide the references for rational formula of the dairy cow.The results showed that the degradation rate of CP decreased gradiently, and the degradation rate of NDF, ADF, DM increased in different stubbles of Alfalfa hay at the same culture period. At the same time, the degradation rate of NDF ADF and DM had positive correlation with the stubble, and the degradation rate of CP had negative correlation with the stubble. The degradation rate of CP in the first-stubble Alfalfa was the highest, 55.52%. The degradation rate of DM in the fourth-stubble Alfalfa was the highest, 60.4%. The degradation rate of NDF in the second-stubble Alfalfa was the highest, 36.9%.The degradation rate of the dry matter in the corn stalks, corn stalk silage and whole-plant silage in rumen changed by the change of cultivation times. The longer the cultivation times was, the greater the degradation rate was. For the same time point, the degradation rate of the dry matter in the whole-plant corn stalk was the highest, the degradation rate of the dry matter in corn stalk silage was the second, the degradation rate of dry matter in the corn-stalks was the lowest. There was a positive correlation between the degradation time and the degradation rate in different types of corn forage in the rumen by a linear correlation and regression analysis.The indices of Leymus chinensis and aspartate changed with the cultivation times changing. The longer the cultivation time was, the greater the degradation rate was.