膨化玉米秸秆发酵饲料对肉犊牛生长性能、养分表观消化率及血清生化指标的影响OA

The study aimed to investigate the effects of extruded corn stalk fermented feed on growth performance,apparent digestibility of nutri-ents,and serum biochemical parameters of beef calves,and to screen the appropriate amount of extruded corn stalk fermented feed to replace corn straw.A total of 75 healthy 7-8 month old F1 beef calves(female)of Simmental×local yellow cattle with a body weight of(200.45±5.22)kg were selected for the experiment and randomly divided into 5 groups,with 15 replicates in each group and 1 calf in each replicate.The control group was fed corn straw,while groups Ⅰ,Ⅱ,Ⅲ and Ⅳ were fed extruded corn straw fermented feed to replace 40%,60%,80%,and 100%of corn straw,respectively.The pre experiment lasted for 10 days and the experimental period lasted for 60 days.The results showed that:① compared with the control group,the average daily feed intake of hybrid F1 beef calves in groups Ⅰ,Ⅱ,Ⅲ and Ⅳ increased,but the differences were not sig-nificant(P>0.05).The average daily weight gain in groups Ⅱ and Ⅲ significantly increased(P<0.05),and the feed-to-gain ratio significantly decreased(P<0.05).② Compared with the control group,the apparent digestibility of dry matter,crude fat,calcium,phosphorus,and organic matter nutrients in hybrid F1 beef calves in groups Ⅰ,Ⅱ,Ⅲ and Ⅳ increased,but the differences were not significant(P>0.05).The appar-ent digestibility of crude protein,neutral detergent fiber,and acid detergent fiber nutrients in groups Ⅱ and Ⅲ significantly increased(P<0.05).③ Compared with the control group,the serum albumin(ALB)content in hybrid F1 beef calves in groups Ⅰ,Ⅱ,Ⅲ and Ⅳ increased,but the differences were not significant(P>0.05).The contents of alanine aminotransferase(ALT),total cholesterol(TG),triglycerides(TC),and creati-nine(Cr)decreased(P>0.05).The total protein(TP)and globulin(GLB)contents in the serum of hybrid F1 beef calves in groups Ⅱ and Ⅲ significantly increased(P<0.05),and the contents of aspartate aminotrans-ferase(AST)and blood urea nitrogen(BUN)significantly decreased(P<0.05).In summary,the addition of 60%and 80%extruded corn stalk fermented feed as a substitute for corn stalk can improve the growth per-formance,apparent digestibility of nutrients,and serum biochemical parameters of hybrid F1 beef calves.