马铃薯淀粉渣和玉米秸秆混合青贮料对肉牛瘤胃内环境及血清生化指标的影响

本试验旨在研究马铃薯淀粉渣和玉米秸秆混合青贮料对肉牛瘤胃内环境及血清生化指标的影响.选择4头平均体重(455.00±19.50)kg的健康秦川杂交肉牛,随机分配到4×4拉丁方试验设计中.4组分别为:1)对照组,40％精料+60％玉米秸秆黄贮料；2)S25组,40％精料+45％玉米秸秆黄贮料+15％马铃薯淀粉渣和玉米秸秆混合青贮料；3)S50组,40％精料+30％玉米秸秆黄贮料+30％马铃薯淀粉渣和玉米秸秆混合青贮料；4)S75组,40％精料+15％玉米秸秆黄贮料+45％马铃薯淀粉渣和玉米秸秆混合青贮料.结果表明:各组肉牛平均日增重、干物质采食量和蛋白质摄入量均差异不显著(P＞0.05).S25、S50和S75组肉牛瘤胃液氨态氮浓度均高于对照组(P＞0.05),分别提高了58.96％、36.35％、26.17％.各组乙酸、丙酸、丁酸、戊酸、总挥发性脂肪酸浓度和乙酸、丙酸、丁酸、戊酸比例及乙酸/丙酸、(乙酸+丁酸)/丙酸均无显著差异(P＞0.05).各组间血清总蛋白、尿素氮和葡萄糖含量均无显著差异(P＞0.05).由此可知,马铃薯淀粉渣和玉米秸秆混合青贮料替代部分玉米秸秆黄贮料能提高肉牛瘤胃液氨态氮浓度,对瘤胃液挥发性脂肪酸含量和血清生化指标无影响.马铃薯淀粉渣和玉米秸秆混合青贮料可以替代肉牛饲粮中75％的玉米秸秆黄贮料.

Mixed Silage of Potato Pulp and Corn Straw Affects Rumen Environment and Serum Biochemical Parameters of Beef Cattle

This study was conducted to determine the effects of mixed silage of potato pulp and corn straw on rumen environment and serum biochemical parameters of beef cattle.Four healthy Qinchuan cross beef cattle with an average body weight of(455.00±19.50) kg were randomly assigned in a 4 × 4 Latin squares design.Four groups included: 1) control group,40% basal diet+60% yellow corn silage;2) S25 group,40% basal diet+45% yellow corn silage+15% mixed silage of potato pulp and corn straw;3) S50 group,40% basal diet+30% yellow corn silage+30% mixed silage of potato pulp and corn straw;4) S75 group,40%basal diet+15% yellow corn silage+45% mixed silage of potato pulp and corn straw.The results showed that there was no significant difference in ADG,DMI and CP intake among all groups(P>0.05).The ammonia nitrogen concentration was increased by 58.96%,36.35% and 26.17% in groups S25,S50 and S75 than that in the control group(P>0.05),respectively.No significant differences were observed in concentrations of acetate propionate,butyrate,valerate,volatile fatty acid and percentage of acetate,propionate,butyrate,valerate,and the rations ratios of acetate to propionate and acetate to propionate and butyrate(P>0.05).No significant differences were observed in contents of total protein,urea nitrogen and glucose in serum(P>0.05).In conclusion,the mixed silage of potato pulp and corn straw can increase the ammonia nitrogen concentration in rumen fluids and do not affect the growth performance,volatile fatty acid content and serum biochemical parameters of beef cattle.Therefore,the study suggests that it is feasible when mixed silage of potato pulp and corn straw replaced 75% yellow corn silage in the beef cattle diet.