酵母浓缩物的不同添加方式对罗斯肉鸡生长性能和营养物质表观代谢率的影响

Effects of yeast concentrate in different adding method on growth performance and nutrient apparent metabolic rate of Ross broilers

选取192羽1日龄罗斯308肉仔鸡,随机分为3组,每组4个重复,每个重复16只鸡。Ⅰ组为对照组,饲喂基础饲粮,Ⅱ组和Ⅲ组在基础饲粮中添加0.2%的酵母浓缩物,其中II组添加方式为1~42日龄连续添加,Ⅲ组为1~21日龄添加而22~42日龄不添加,试验期42d。结果表明:1~21日龄,和对照组比较试验Ⅱ组和Ⅲ组ADG分别提高9.84%(P<0.05)和9.43%(P<0.05),干物质和粗脂肪表观代谢率提高(P<0.05),试验组间差异不显著(P>0.05);22~42日龄,Ⅱ组和Ⅲ组ADG分别提高12.06%(P<0.05)和5.18%(P>0.05),试验组组间差异不显著(P>0.05);试验组营养物质表观代谢率均高于对照组,但试验组组间差异不显著(P>0.05)。1~42日龄,Ⅱ组Ⅲ组ADG分别提高11.47%(P<0.05)和6.28%(P<0.05),ADFI提高(P>0.05),F/G降低(P>0.05)。综合分析,酵母浓缩物可以提高肉仔鸡的平均日增重和营养物质表观代谢率,降低料重比,并具有后续促生长的作用。

In order to investigate the influence of yeast concentrate in different adding methods on growth performance and nutrient apparent metabolic rate of Ross broilers, 192 one-day 308 Ross broilers were divided into 3 groups with 4 repeats of 16 each. Group I fed on basic diet as the control group, groups II and III fed on 0.2% yeast concentrate added in basic diet from 1 to 42 days and 1 to 21 days, respectively. The result showed that at 1-21 d, compared with the control group,the ADG of group II and III was increased by 9.84%（P〈0.05）and 9. 43%（P〈0.05） ,the apparent utilization of dry matter and crude fat was improved significantly（P〈0.05）, there was no obvious difference between the two treated groups. At 22-42 d,the ADG of group U and III was increased by 12.06% （P〈0.05） and 5.18%（P〈0.05）respectively,the utilization rates of nutrient substances in both treated groups was higher than that of control group, there was no significant difference between two treated groups （P〉0.05）. At 1-42 d,the ADG of group II and III was increased by 11.47G（P〈0.05）and 6.28%（P〈0.05）,the ADFI was increased（P〉0.05）and the F/G was decreased（P〉0.05）. In conclusion,supplementation of 0.2% yeast concentrate can increase ADG and nutrient apparent metabolic rate.