大米糖浆替代乳糖对早期断奶仔猪生长性能及胰岛素样生长因子轴的影响

Effects of Rice Syrup Replacing Lactose on Performance and Insulin-like Growth Factor Axis of Early Weaned Piglets

本文旨在研究大米糖浆取代乳糖后对早期断奶仔猪生产性能及胰岛素样生长因子轴的影响。选用7d断奶的二元杂交仔猪(长白×大白)32头,随机分为2个处理组,每组设16个重复,每个重复1只。日粮成分除乳糖水平外(乳糖组和大米糖浆组分别为43.5%和0),其他成分均一致。试验期14d,在试验第7天、第14天和第21天对试验猪进行空腹8h称重,计算试验期日增重及日耗料,并分别于试验第7天和第14天每组随机抽取5头,颈静脉采血,屠宰速取肝脏和背最长肌组织。结果表明,大米糖浆取代乳糖后对仔猪的日增重及肉料比均没有显著影响(P>0.05),14d大米糖浆组血清GH水平与乳糖组差异不显著(P>0.05),21d大米糖浆组血清GH水平极显著低于乳糖组(P<0.01);但大米糖浆组14d和21d血清IGF-I的水平,及肝脏和背最长肌IGF-ImRNA相对表达量与乳糖组差异均不显著(P>0.05)。综合分析认为,大米糖浆替代乳糖后对早期断奶仔猪的生长性能和胰岛素样生长因子轴没有影响。

The effects of rice syrup as a substitute of lactose on the performance and insulin-like growth factor axis of early weaned piglets were studied. A total of 32 weaned dualistic crossbreed piglets （Yorkshire x Landrace）, initially weighed （2.68± 0.34） kg and of 7 d-old, were divided into two treatments. Sixteen pigs were randomly assigned to one of the two treatments （43% lactose group, no lactose for rice syrup group）. The experiment lasted for 14 days. Five piglets were randomly selected from each treatment for termination on the 14^th day and the 21^st day, respectively. When the lactose was replaced by the rice syrup, there was no effect on the daily gain and the G ： F （P〉0.05）, the serum GH level in rice syrup group was extremely significantly lower than that in the lactose group on the 21^st day （P〈0.01）, but not significantly different on the 14^th day （P〉0.05）. There was no significant difference on the serum IGF-I level, the abundance of IGF-I mRNA in liver and muscle on the 14^th day and the 21^st day （P〉0.05）. The results suggested that there was no effect on the performance and insulin-like growth factor axis in weaned piglets when the lactose was substituted by the rice syrup.