紫草等中草药对粤黄雏公鸡去势效果的观察

CASTRATION EFFECT BY LITHOSPERMUM ERYTHRORHIZON SIEB. AND ALLIED TRADITIONAL CHINESE MEDICINES IN YUEHUANG COCKERELS

在粤黄雏公鸡的日粮中添加了不同剂量（试验Ⅰ组０７５％、试验Ⅱ组１５０％、试验Ⅲ组３００％）的紫草等中草药提取物。在雏公鸡生长的第６、８周龄时，试验Ⅱ、Ⅲ组体重显著高于对照组（Ｐ＜００５和Ｐ＜００１），１０周龄时各组体重无显著差异（Ｐ＞００５）。在第８、１０周龄时，各试验组鸡的睾丸重、睾丸指数和血清睾酮水平均显著（Ｐ＜００５）或极显著（Ｐ＜００１）地低于对照组鸡的数值。添加中草药还极显著抑制鸡冠和肉髯的发育，并显著提高了胸肌中粗蛋白含量，但对腿肌粗蛋白含量、胸腿肌中水分和粗脂肪含量无显著影响。上述结果提示本试验所用紫草等中草药提取物具有促进粤黄雏公鸡生长、抑制性腺和冠髯长育、降低血清睾酮水平及改善肉质的作用。

he effects of the extracted materials (dosages: 0.75%,1.50% & 3.00% added to diets of experimental groups Ⅰ,Ⅱand Ⅲ respectively) from tradionally Chinese medicines on body weight gain, development of testis, comb and wettle, levels of serum testosterone and meat quality were investigated in Yuehuang cockerels. Compared with the control cockerels, the body weights of treated groups Ⅱ and Ⅲwere higher (P<0.05 and P<0.01) at the end of 6th and 8th week. In the 8th and 10th week, testicular weights , testicular indexes and serum testosterone levels in all treated groups showed a dose dependent decrease. The treatment also dampered development of comb and wettle, significantly increased contents of crude protein in breast muscle, but had no significant effects on crude protein in leg muscle, water and fat contents in both breast and leg muscles. The above results indicated that the extracted materials from tradional Chinese antifertility medicines were capable of promting weight gain of cockerels, inhibiting growth of testis, comb and wettle, reducing levels of serum testosterone, improving meat quality and exert a significant castration effect on cockerels.