Effects of Soybean Residue Mixed Silage on Growth Performance,Nutrient Apparent Digestibility,Rumen Fermentation and Methane Emission of Cows
In this study,soybean residue(SR),wheat bran and corn flour were used as raw materials for mixed fermentation at a ratio of 8∶1∶1 based on fresh weight(65％moisture content after mixing)to obtain SR mixed silage,which was used to replace soybean meal,wheat bran and corn in the basal diet of young dairy cows.To investigate the effects of SR mixed silage on growth performance,the nutrient apparent digestibility,feeding cost,serum biochemical indexes,rumen fermentation and methane(CH4)emission of cows.The ex-periment was a randomized complete block design,and 24 Holstein dairy heifers with the similar body weight of(311.0±29.8)kg,were employed and divided into two groups as control group and SR mixed silage group,and each group had 12 cows.Results showed that SR mixed silage exhibited good fermentation quality,as indicated by the low pH and great lactate content.Compared with control group,cows fed SR mixed silage had no influence on the dry matter(DM)and organic matter(OM)intake(P＞0.05),while had greater acid detergent fiber(ADF)intake(P＜0.05)and a tendency of greater crude protein(CP)intake(P=0.06).Cows fed SR mixed silage had lower apparent nutrient digestibility of OM and neutral detergent fiber(NDF)(P＜0.05),and a tendency of lower apparent nutrient digestibility of DM(P=0.07).SR mixed silage group exhibited greater average daily gain(ADG)(P＜0.05),and lower feed cost for the whole experiment(P＜0.05).SR mixed silage group had greater contents of cholesterol(TC),triglyceride(TG),blood ammonia(BA)and complement 4(C4)in serum(P＜0.05).The CH4 emission and the main rumen fermentation pa-rameters were not significantly different in the control group and SR mixed silage group(P＞0.05).In conclu-sion,SR mixed silage has no adverse effects on the growth performance,rumen fermentation and serum bio-chemical indexes of cows,and can be used as an economical concentrate resource in production of dairy cows.[Chinese Journal of Animal Nutrition,2024,36(3):1724-1733]
万方数据
维普
