锌对肉用种公鸡生长发育期性成熟的影响

Effects of dietary zinc on the sex maturity of male broiler cockerels

本文研究了不同锌水平饲粮对种公鸡性成熟期体重和睾丸生长发育的影响。结果表明:饲粮中不同锌添加量显著或极显著影响15～25周龄种公鸡的体重(P<0.05)、睾丸重(P<0.01)、睾丸体积(P<0.01)、睾丸指数(P<0.01)、曲精细管管径(P<0.01)、生殖上皮厚度(P<0.05)和间质细胞核径(P<0.05),而对鸡髯大小无显著影响;随饲粮锌添加量增加,体重、睾丸重、睾丸体积、睾丸指数和间质细胞核径呈显著的二次曲线变化;体重与睾丸重和睾丸体积呈极显著正相关,而鸡髯大小与睾丸重和睾丸体积呈显著正相关。综合考虑各项参数,生长发育期AA肉用种公鸡在饲喂玉米-豆粕型饲粮时(含锌25.6mg/kg)锌的适宜添加量为75～85mg/kg。

A experiment was conducted to study the effects of dietary zinc on the the body weight,sex maturity,development of testes of male broiler cockerels.There are six treatments with different dietary supplement level of zinc （0, 30, 60, 90, 120 and 150mg/kg respectively）. 90 15-week-old male AA broiler cokerels with similar body weight （2147 ± 113g） were divided into 6 treatments randomly, supplemented to basal diet. Each treatment was replicated three times （5 cockerels per replicate）, and the trial lasted 10 weeks. The re, suits indicated that the dietary zinc level influenced significantly the 25 weeks body weight （P〈0.05）, testes weight （P〈0.01）, testes bulk （P〈0.01） and testicular index （P〈0.01） with no significant influence on the beard size （P 〉 0.05）. The body weight, testes weight, testes bulk ,testicular index and diameter of interstitial cell IR2=0.907, P=0.029） were increased quadratic. The body weight was positive correlated with the weight and bulk of testes. The size of beard also was positive correlated with the weight and hulk of testicle. The optimum dietary supplement of zinc was 75 - 85mg/kg.