热应激条件下日粮消化能水平对肉兔生产性能和养分消化率的影响

试验旨在研究热应激条件下日粮消化能水平对肉兔生产性能和饲粮养分消化率的影响。选择30日龄断奶新西兰兔150只,随机分成5个处理组,每个处理5个重复,每个重复6只兔,分别饲喂8.79、9.62、10.46、11.30MJ/kg和12.13 MJ/kg消化能的饲粮。结果显示,热应激条件下,随着日粮消化能的增加,肉兔采食量和料重比均一定程度下降(P>0.05或P<0.05),日增重呈先升高后降低的趋势;干物质、粗蛋白质和粗灰分消化率随着消化能水平的提高,呈现先上升后下降的趋势,粗脂肪和粗纤维的消化率随着消化能水平的提高,呈现逐渐升高的趋势。综合来看,在热应激条件下肉兔饲粮的消化能水平以10.46～11.30 MJ/kg为宜。

Effects of dietary digestible energy on the growth performance and nutrient digestibility of meat rabbit under heat stress

This experiment was conducted to study the effects of dietary digestible energy on growth performance and nutrient digestibility of meat rabbits under heat stress.150 New Zealand rabbits were divided into 5 groups with 5 replications of 6 each,and were fed with diets containing 8.79,9.62,10.46,11.30 MJ/kg and 12.13 MJ/kg digestible energy,respectively.The results showed that:under heat stress,digestible energy level of rabbit diets had effect on the feed intake,daily gain and feed conversion ratio.With digestible energy level increasing,the feed intake and feed conversion ratio of meat rabbits decreased,while,daily gain increase first,but then decreased slowly;with digestible energy level increasing,the digestibility of dry matter,crude protein and ash first increased and then decreased slowly,while the digestibility of ether extract and crude fiber increased slowly.In conclusion,under heat stress,the appropriate dietary digestible energy levels of meat rabbits were 10.46 ～ 11.30 MJ/kg.