早期断奶对舍饲哈萨克羔羊生长性能及血液生化指标的影响

Effect of early weaning on growth performance and blood biochemistry indicators in the barn feeding Kazark lamb

旨在研究不同断奶日龄对哈萨克羔羊生长性能及血液生化指标的影响,进而确定哈萨克羔羊早期断奶的最佳时间。按照出生日龄基本一致、体重接近、性别一致、母羊产羔胎次一致的原则将16只哈萨克羔羊（♂）随机分成4组,对照组随母羊哺乳,试验组羔羊分别在第30、38和45天断奶,饲喂代乳料。结果表明：（1）38 d断奶组体重指标和日增重指标均显著高于对照组和30 d断奶组（P〈0.05）,30 d断奶组体重指标和日增重指标均低于其他三组（P〈0.05）;（2）断奶日龄对哈萨克羔羊胸围指标影响不大（P〉0.05）;在60日龄时,30d断奶组体高显著低于其他三组（P〈0.05）;并且在38日龄和60日龄时,30 d断奶组体长也显著低于其他三组（P〈0.05）,可能是由于断奶过早,断奶应激过大所致。（3）羔羊2月龄时,血液生化指标测定结果中38 d断奶组的蛋白含量、钙离子含量、葡萄糖含量均高于其他三组,且与对照组相比差异显著（P〈0.05）;尿素氮的含量随着断奶日龄的延长而增加;无机磷和总胆固醇的含量随着断奶日龄的延长而减少;其他血液生化指标差异均不显著（P〉0.05）。分析认为：对哈萨克羔羊实施早期断奶切实可行,经综合评定,哈萨克羔羊于38日龄断奶效果较好。

The experiment was designed to explore the effect of early weaning on growth performance and blood biochemistry indicators in the Kazark lamb and clarify the optimal time of early weaning. Based on the principles of the proximate born date and body weight,the same sex and same times of producing lamb,16 lambs were divided into 4 groups randomly. The control group was fed with ewe milk while the experimental groups fed with milk-replacer after weaning in 30,38 and 45 days,respectively. The results indicated that both body weights and average daily gain in 38 day weaning group was significantly higher than that in control and 30 days weaning groups（ P〈0. 05）. In addition,the weaning day had little effects on chest circumference index of lamb（ P〈0. 05）; as for height index,60-day-old lamb in 30 days weaning group was significantly lower than the other groups（ P 〉0. 05）. As for length index,38-day-old and 60 day-old lamb in 30 day weaning group was significantly lower（ P〈0. 05）. It might be due to premature weaning because of weaning stress. Furthermore,the protein content,Calcium concentration and glucose concentration of 38 day weaning group was significantly higher than that of other groups when lamb was 2months old,in which control group shows the most significant differences in albumin（ P 0. 05）. The amount of urea nitrogen increased as the weaning days were prolonged,while inorganic phosphorus and total cholesterol decreased. The 4 groups of lamb showed little significant difference in other blood biochemistry indicators. In conclusion,the feasibility of early weaning in Kazark lamb was testified from a series of analyses,and the optimal time of weaning for Kazark lamb was 38 days after birth from the synthetic evaluation.