【摘要】 [目的]研究活性干酵母(active dry yeast,ADY)对西门塔尔育肥牛饲料消化率和日增重的影响。[方法]选择西门塔尔肉牛30头,随机分成3组,A组为对照组,B组、C组为试验组。A组牛饲喂基础日粮,B组每头牛每天基础日粮+饲喂10 g酵母菌1,C组每头牛每天饲喂基础日粮+10 g酵母菌2,分早晚2次饲喂。预饲期为5 d,正试期为28 d。利用粪便分离筛对育肥牛饲料消化率进行评估,并计算日增重。[结果]试验第21天,C组上层粪筛滞留物比例显著(P<0.05)低于A组。试验第28天,C组中层粪筛滞留物比例低于A组和B组,并显著(P<0.05)低于试验第7天、第14天和第21天。试验第28天,C组下层粪筛滞留物比例最高,并显著(P<0.05)高于试验第7天和试验第14天。2个试验组的平均日增重均高于对照组,试验C组的平均日增重显著(P<0.05)高于A组和B组。[结论]日粮中分别添加2种活性干酵母可提高西门塔尔育肥牛的日增重,并在一定程度上提高饲料消化率,酵母菌2的效果更好。更多还原

【Abstract】 [Objective]To assess the effects of dietary supplementation of active dry yeast （ADY） on feed digestibility and daily gain of fattening Simmental cattle.[Method]A total of 30 Simmental cattle were randomly split into three groups.Group A was the control,groups B and C were the experimental groups.Group A was fed with the basal diet,and groups B and C were fed with the basal diets supplemented with NO.1 ADY （10 g/d） and NO.2 ADY （10 g/d） twice daily,respectively.The pre-feeding phase was 5 days followed by 28 days formal trial period.Fecal separation sieve was used to assess the feed digestibility of the experimental fattening cattle,and the daily gain was monitored.[Result]On day 21 of the experiment,the proportion of up-level fecal sieve residue in group C was significantly （P<0.05） lower than that in group A.On the 28^thday of the experiment,group Chad lower proportion of middle-level fecal sieve residue than groups A and B,and was significantly （P<0.05） lower than that on the 7^th,14^th,and 21^stdays of the experiment.The proportion of lower-level fecal sieve residue in group C was the highest on the 28^thday of the experiment,and was significantly （P<0.05） higher than that on the 7^thand 14^thdays of the experiment.The average daily gain of the two experimental groups was higher than that of the control group.The average daily gain of group C was significantly （P<0.05） higher than that of group A and group B.[Conclusion]Dietary supplementation of NO.1 and NO.2 ADYincreased the daily gain of fattening Simmental cattle and enhanced the feed digestibility to a certain degree.NO.2 ADY exhibited a better effect.更多还原