活性干酵母添加水平对产蛋初期铁脚麻种鸡生产性能的影响

Effects of the Additive Level of Active Dry Yeast on the Productive Performance in Tiejiaoma Breeder during Early Laying Period

为探讨活性干酵母（ADY）添加水平对产蛋初期铁脚麻种鸡生产性能的影响，选用153d铁脚麻种鸡1008只，随机分成4组，每组3个重复，每个重复84只。对照组饲喂基础日粮，试验1、2与3组分别饲喂添加100、300与600g／tADY的日粮。测定试验前期（O～13d）、后期（14～33d）及全期（0～33d）产蛋率与破蛋率。结果表明：添加100g／tADY组0～13d及0～33d产蛋率极显著或显著高于对照组（P〈0．01或0．05），各期破蛋率与对照组无显著差异（P〉0．05）；添加300g／tADY组各期产蛋率与对照组无显著差异（P〉0．05），14～33d及O～33d破蛋率显著高于对照组（P〈0．05）；添加600g／tADY组14～33d及0～33d产蛋率极显著或显著低于对照组（P〈0．01或0．05），14～33d破蛋率显著高于对照组（P〈0．05）。表明适量添加ADY可以改善产蛋率，添加效应随时间延长有降低趋势；过量添加会降低产蛋率并增加破蛋率。

This experiment was conducted to study the effects of active dry yeast （ADY） on the productive performance of the early laying period of Tiejiaoma breeder. One thousand and eight Tiejiaoma breeders with 153-day-old were randomly divided into four groups with 3 repeats per group, 84 for each repeat. The control group was fed with the basal diet and trail groups 1,2 and 3 were fed with the diets supplied with 100,300 and 600g/t ADY respectively. The feeding trial lasted for 39 days with 6 pre-feeding days and 33 trial days. The intensity of laying and the rate of broken egg of each group was determined in the 1st stage （0--13d）,the 2nd （14--33d） and the whole stage （0-33d）. The results showed that the laying rates of 100g/t group were extremely significant higher than control group in the 1st stage （ P 〈 0.01 ） and significant difference in the whole stage （ P 〈 0.05 ）, but there were no significant difference in the rate of broken egg in the three stages （ P 〉 0.05 ）. There were no evident difference in the laying rate between 300g/t and control group during the three stages （ P 〉 0.05 ）. But the rates of broken egg were remarkably higher than control group in the 2nd and the whole stage （ P 〈 0.05 ）. The laying rates of 600g/ t group were extremely remarkable lower than control group in the 2nd （ P 〈 0.01 ） ,and significant difference in the whole stage （ P 〈 0.05 ）, and the rate of broken egg was significantly higher than control group （ P 〈 0.05 ）. The appropriate amount of ADY could improve the laying rate, and the effect of the additive had a reducing tendency with time extending. The excessive amount would reduce the laying rate and increase the rate of broken egg.