半胱胺对育成期银狐生长性能的影响

The Application of Cysteamine on the Growing Function of Silver Fox in Rearing Period

为研究半胱胺对育成期银狐生长性能的影响，选用2月龄左右、健康银黑狐仔狐224只（公母各半）。其中公狐体重在2．50kg左右（P〉0．05），母狐体重在2．10kg左右（P〉0．05）。随机分200只（公母各半）为试验组，剩余24只（公母各半）为对照组。饲养试验持续时间大约为3个月（2004年6月10日～8月31日）。采用复因子试验设计中的析因试验设计，为二因子有重复的试验设计。在5个不同半胱胺添加时间间隔（1、3、5、7和9d）中分别添加5个不同数量的半胱胺（每千克体重添加10、40、70、100和130mg）。对照组分为12个重复，每个重复2只（公母各半）。试验测定了银狐的采食量、饲料转化率及体增重。结果表明，在25个组合中只有每间隔5d按70mg／kg体重浓度添加1次半胱胺组可使银狐体增重及饲料转化率达到最高，分别比对照组提高15．08％（P〈0．05）和20．21％（P〈0．01）。整个试验组银狐采食量都低于对照组，其中70mg／kg体重5d组采食量比对照组降低4．52％（P〈0．05）。

To study effect of cysteamine on the growing function for silver fox in rearing period, 224 （112♂ ＋112 ♀） of two-month-old healthy silver foxes were selected, and the male weigh about 2.50 kg （P〉0.05） ,while the female around 2.10 kg （P〉0.05）. Among them, 200 （100 ♂＋100 ♀） foxes were randomly selected for the test group, and the other 24 （12♂ ＋12 ♀） individuals were for the control group. Feeding experiments last about three months （from June 10 to August 31 in 2004）. Experiment design of factor analysis, a multiple factor design, was adopted, in which two factors were repeated in experiments. Different amount of cysteamine （10 mg, 40 mg, 70 mg, 100 mg, 130 mg per kg of body weight BW） were added respectively at 5 different time intervals （1 d, 3 d, 5 d, 7 d and 9 d）. There were 12 repeats of test in control groups, and a couple of individuals for each one. Finally, body weight gain, feed conversion ratio and feed intake were measured. Results showed that only the combination of 70 mg/kg BW of cysteamine added every 5days would produce the highest body weight gain and feed conversion ratio among total 25 combinations, meanwhile it increased by 15.08% （P〈0.05） and 20.21% （P〈 0.01） respectively compared with those of the control group. However, feed intake of the test groups silver fox was lower than that of the control group, individuals of the combination of 70 mg/kg BW of cysteamine added every 5days decreased 4.52% （P〈0.05） of feed intake compared with control group.