An experiment was carried out with a total of 280 1-day-old commercial broilers to investigate the effects of different dietary microecological preparation source and level on growth performance. Birds were randomly assigned by body-weight to one of 7 treatments (five pen replicates of eight chicks each). The test design for earlier stage (1 to 21 d) and later stage (22 to 42 d) , and all groups shared one control group. The results showed that dietary microecological preparation significantly affected (P<0. 05) the ADFI and ADG, but no differences among microecological preparation sources in above indices during 1 to 21 d (F>0. 05). During 22 to 42 d, compared with the control group, ADG and F/G was significantly affected by the microecological preparation I and II (P<0. 05), ADG increased linearly (P<0. 05) and F/G significantly decreased as dietary microecological preparation level increased (P<0. 05). For the whole staged to 42 d), microecological preparation significantly affected (P<0. 05) the ADG and F/G, ADG increased linearly (P<0. 05) and F/G decreased linearly (P<0. 05) as microecological preparation supplement level increased. In conclusion, supplementation of microecological preparation improved the growth performance of broilers.%本试验旨在研究日粮中添加不同种类及水平的微生态制剂对肉仔鸡生长性能的影响.将280只1日龄肉仔鸡按体重随机分成7个组,每组5个重复,每个重复8只鸡；试验分前期(1～21 d)和后期(22～42 d)两个阶段.结果表明,1～21 d,添加微生态制剂显著提高了肉仔鸡平均日采食量和平均日均重(P＜0.05),而不同种类微生态制剂之间无显著差异(P＞0.05);22～42 d,微生态制剂Ⅰ、Ⅱ组的平均日增重显著高于对照组(P＜0.05),随着微生态制剂添加水平的升高,肉仔鸡平均日增重呈线性增加(P＜0.05),料重比显著降低(P＜0.05)；从整个试验期(1～42 d)来看,添加微生态制剂显著提高了肉仔鸡平均日增重(P＜0.05),显著降低了料重比(P＜0.05)；随着微生态制剂添加水平的升高,肉仔鸡平均日增重呈线性增加(P＜0.05),而料重比呈线性下降(P＜0.05).因此,添加微生态制剂显著提高了肉仔鸡的生产性能.
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