Associative Effects Between Crude Protein And Corn Stover And Effect Of Fermentation On Rumen And Weight Gain In Sheep

The aim of this study was to estimate the associative effects among corn strover(corn silage)and different N source using gas production in vitro; and investigate the changes of performance,the digestion and metabolism in sheep, the control group was fed complete diet pellets consists of levels of supplementation of urea and corn strover. which laid the theoretical foundation for application of triticale corn strover in animal feeding. The study including following four part:Experiment 1 The present research was conducted to investigate the associative effects(AE) among corn strover, soybean meal, cottonseed meal, rapeseed meal and urea, at the same time, PH and the concentration of NH3-N were determined. The results indicated that positive effect was observed among NDF(corn strover) and CP(the four protein feeds)in 96h.And significant positive effect was observed among NDF(corn strover)and different level of soybean (9%to18%CP), cottonseed meal( 8% to15% CP),rapeseed meals(10%to18%CP)and urea (8%to15% CP) and the maximum was detected when protein level was 15%, 12%,13%,12%at 24h. The pH and NH3-N were a numeric increasing with CP NDF and the ratio of the increase in the fermentation broth pH and concentration of NH3-N upward trend, Urea and corn silage fermentation combination of pH changes in the larger trend.Experiment 2 The present research was conducted to investigate the associative effects(AE) among corn silage, soybean meal, cottonseed meal, rapeseed meal and urea, at the same time, PH and the concentration of NH3-N were determined. The results indicated that positive effect was observed among NDF(corn silage)and CP(the four protein feeds)in 96h. And significant positive effect was observed among NDF(corn silage)and different level of soybean (11%to16%CP), cottonseed meal (11% to17% CP ), rapeseed meals (11%to18% CP)and urea(10%to14% CP) and the maximum was detected when protein level was 15%,14%, 15%, and 13% at 24h. The pH and NH3-N were a numeric increasing with CP NDF and the ratio of the increase in the fermentation broth pH and concentration of NH3-N upward trend, Urea and corn silage fermentation combination of pH changes in the larger trend.Experiment 3: A 4×4 Latin square test, through four the health small-tail sheep ram with 32±2Kg live weight and the four different level of dietary curue protein (8% ,10%, 12% and 14% )of the was conducted and all tial animals were farmed cage-cage in professional metabolism cage. The results showed: with increasing of crude protein levels dry matter intake (DMI) was reduced and crude protein intake (CPI) of 14% CP group was maximum; the intakes of dry matter, corn stalks, NDF, ADF of 8% CP group was the maximum and significantly higher than 14% CP group; digestibilities of DM, ADF, NDF in 12% CP group were the maximum, but the difference among all groups was not significant (P>0.05); nitrogen intake, digestible nitrogen and nitrogen deposition shown increasing trend with dietary crude protein level increasing.Experiment 4: 36 Poll Dorset sheep(80～140 days age)were divided into three groups by an average weight of 28.8±1.4kg , which were feed with dietary consisted of corn stalks and urea with 8%, 11% and 14% CP level respectively, for the 60-day fattening test. The results showed: by providing protein feed urea and corn stalks into the suppression of different levels of the protein particles feed on the development of sheep's bodies size were not significantly affected by different dietray,the total weight and the daily gain and feed conversion rate of sheep with 11% CP level dietary were significantly higher than anothers.