The Effect Of Supplement Roasted Soybean On Rumen Metabolism, Dairy Performance And Blood Indices Of Dairy Cows

The thesis researched the interaction between the milk yield and milk quality first, then attaching how to solve the problem of low milk quality using nutritional manipulation ways, studied the effect of supplement roasted soybean on the milk yield, milk quality, blood biochemical parameters , nutrient apparent digestibility and runimal fermentation of ruminant.ExperimentΙ: Total 336 lactating cows as the research object, the test was divided into four consecutive stages (the stage of pre-reducing milk yield, the stage of reducing milk yield, the stage of resuming milk yield and the stage of improving milk yield ) to research and analyse. The time of every stage was 20 days and the daily milk yield and some indicators of milk quality were determined at the last 10 days of erery stage. The results indicated that the corrlation of the daily milk yields, the milk protein percentages ,milk fat percentage , not fat milk solid (SNF) percentages and lactose percentages were significant (P<0.01) .Experimentâ…¡: Twenty early lactating period of Holstein cows were divided into two groups (n=10) of groupâ… supplied roasted soybean 0.7kg.head^-1.d^-1 and groupâ…¡supplied roasted soybean 1.2kg.head^-1.d^-1. The results indicated that the body weight and the body condition scoring could be increased better by groupâ… ; the time of the peak of the milk production could reach early by groupâ…¡and the reduction of the milk yield could be alleviated by groupâ…¡after the peak; the reduction of the percentage of solids-not-fat and milk lactose could be alleviated better by groupâ…¡and groupâ…¡could increase the percentage of milk protein better than groupâ… ; the contents of TP, ALB and GLO in blood were higher in groupâ…¡and the reduction of the contents of GLU and CHO could be alleviated better by groupâ…¡.Experimentâ…¢: Twenty late lactating period of Holstein cows were divided into two groups (n=10) of groupâ… supplied roasted soybean 0.5kg.head^-1.d^-1 and groupâ…¡supplied roasted soybean 1kg.head^-1.d^-1. The results indicated that the body weight could be increased better by groupâ…¡; the milk yield could be increased better by groupâ…¡at the early period of the experiment and and the reduction of the milk yield could be alleviated better by groupâ…¡at the late period of the experiment; the percentage of milk fat of two groups were increased after the experiment, but there were insignificant difference between the two groups (Pï¹¥0.05) ; at the early period of the experiment the percentage of solid-not-fat , milk protein and milk lactose could be increased by groupâ…¡; the contents of TP and GLO in blood were higher in groupâ…¡and the reduction of the contents of GLU could be alleviated better by groupâ…¡.Experimentâ…£: Six growing wethers were selected to study the effect of supplemental roasted soybean with different levels on dry metter intake, nutrient apparent digestibility, pH value and NH₃-N concentration.The whole experiment period was divided into two parts, one part was pre-experiment with 7 days and another part was formal experiment with vines 6 days. Basal diet consisted of peanut stalks and concentrates. The lambs were fed with basal diet of control group; BR+RS 16g/d of groupâ… ; BR+RS 27g/d of groupâ…¡; BR+RS 38g/d of groupâ…¢. The results showed that: (1) Contrast to the control, dry matter intake could be increased by groupâ… ,but reduced by groupâ…¡and groupâ…¢. (2) There were not significant differences(P>0.05)among four treatments in the digestibility of CP, EE, NDF, ADF, DM and OM, but the digestibility of NDF, ADF and OM could be increased by groupâ… ,but reduced by groupâ…¡and groupâ…¢. (3) There were not significant differences(P>0.05)among four treatments in pH value and NH₃-N concentration.