酵母培养物对雏鸡生长性能、免疫器官发育和血清相关激素的影响

选用7日龄海兰褐蛋用公雏鸡180只,随机分成3组(对照组,试验Ⅰ组、试验Ⅱ组),每组设3个重复,每重复20只雏鸡。对照组饲喂基础日粮,试验Ⅰ、Ⅱ组在基础日粮中分别添加2.5%和5%的酵母培养物,试验期6周,研究酵母培养物对雏鸡生长性能、免疫器官发育和血清相关激素的影响。结果表明,①在日粮中添加酵母培养物可以提高蛋雏鸡的平均日增重(P＜0.05),降低料重比(P＜0.05),并提高成活率(P＞0.05);②酵母培养物能够促进蛋雏鸡免疫器官的发育,提高其器官指数(P＜0.05)。③血清激素含量测定结果表明,添加酵母培养物组鸡血清中三碘甲状腺原氨酸(T3)、甲状腺激素(T4)水平显著提高(P＜0.05),皮质醇(COR)含量显著降低(P＜0.05),生长激素(GH)含量有所升高(P＞0.05)。

Effects of Yeast Culture on the Growth Performance,Immune Organs Development and Serum Related Hormones Concentration of Laying Chicks

One hundred and eighty seven-day-old Hy-line Brown laying chicks were chosen and divided into three groups randomly, three replicates per group, twenty chicks per repetition. The chicks in the controlled group were fed with basal diet. The chicks in experiment group Ⅰ and Ⅱ were fed with basal diets distinctively added with 2.5% and 5% yeast culture for six weeks. The experiment aimed to investigate systematically the effect of yeast culture on the growth performance, immune organs development and serum related hormones concentration of laying chicks. The results showed as follows:①Addition of yeast culture could elevate the average daily gain(P＜0.05),reduce the feed/gain(P＜0.05) and elevate the survival rate(P＞0.05) of laying chicks. ②Addition of yeast culture enhanced immune organs development and elevated their weigh index(P＜0.05). ③Yeast culture addition elevated serum T3 and T4 concentration(P＜0.05) and reduced serum COR concentration(P＜0.05). The concentration of GH in experiment group Ⅰand Ⅱ were higher than that of the control, but the difference was not significant(P＞0.05).