Abstract: "The study was to find out the relationship between the contents of each protein fractions and the degradation and the digestibility of 11 feeds common used in China.Chemical contents were determined according to the methods provided by CNCPS Version 5.0.The mobile nylon bag technique was used to investigate the apparent small intestinal digestibility of crude protein(CP) and dry matters(DM).Three dairy cows fitted with permanent ruminal cannulas and T-type duodenal cannulas were used to investigate intestinal digestibility of CP and DM by mobile nylon bag technique in soybean meal(SBM),cottonseed meal(CSM),rapeseed meal(RSM),peanut meal(PM),flaxseed meal(FSM),linseed meal(LSM),distillers dried grains(DDGS),expanded soybean(ES),corn grain(CG),brewer's grains(BG),alfalfa hay(AH),chinese wildrye(CW) and whole corn silage(WCS).The content of undegraded protein after 16 h incubation was affected by the NDF and PB3 fractions.The content of RUP have a high relationship with contents of the NDF and PA fractions.The absorbed DM increased while the feeds have more NDF.The protein content absorbed in the intestine can be mainly predicted by the NDF and PC content.In our result,we can see that the intestinal absorbed DM and CP have a high relationship with the content of each protein fractions,the potential of each feedstuffs that can provide for animal intestinal protein were dissimilar,and the potential that can provide for animal with intestinal protein. "

Key words: Prote in fractions, Intestinal digestibility, CNCPS, Ruminants

CLC Number: 

• S816.4