二氢吡啶对雏鸡血清甲状腺素和皮质醇含量影响的研究

为探求二氢吡啶促雏鸡生长发育的机理，试验分两批进行。（1）选用28日龄海赛克斯父母代母雏250只，随机分为5组，日粮中添加不同浓度的二氢吡啶。饲养试验表明二氢吡啶可促进雏鸡的生长，且以150mg／kg组促生长作用最佳，添加饲喂到61d时，体重比对照组提高7.68％（P＜0.01），血清中T

THE EFFECTS OF DILUDIN ON THE SERUM CONCENTRATION OF THYRONINE

In order to understand the effect of diludin on the growth of laying-chickens and the mechanism of promoting growth，we carried out two trails．（1） 250 hisex-breeding-chickens（28d） were selected and divided into five groups．Diludin with different concentrations were added in each group’s feed．The result showed that Diludin could promote the growth of the chicken．The effect of 150 mg／kg group was the best among the groups．Up to 61-day feeding，the weight of 150 mg／kg group increased by 7．68％ as compared with control group （P＜0.01）．Up to 60-day feeding，the concentration of T3 increased by 33．90％ as compared to control group （P＜0.01）．T4 had the tendency of decrease．The secretion of cortisol was restrained．Up to 60-day feeding，its concentration decreased by 34．71％ as compared with control group （P＜0.01） the average laying rate was above 50％，age at first laying was one week earlier than that in control group．（2） 5756 904-breeding-chicken（7d） were selected and divided into two groups randomly．Diludin was added in the trail group’s feed with 150 mg／kg feed．The result showed that the weight and T3 of trail-group increased by 9．91％（P＜0．01） and 25．82％（P＜0.05） respectively as compared with control group．T4 decreased by 21.91％（P＜0.05） as compared with control group．