日粮ADF水平对断奶肉兔肠道健康、营养物质消化及生产性能的影响

选用100只体重相近的35日龄断奶新西兰肉兔,随机分为5组,分别饲喂不同水平酸性洗涤纤维(ADF,13%、16%、19%、22%和25%)的日粮,探讨我国生长肉兔适宜的ADF需要量。结果表明:试兔肠道健康状况受日粮ADF水平影响较大,13%和16%ADF组肉兔腹泻发生率和健康风险指数明显高于其他各处理组;平均腹泻时间随ADF水平的提高逐渐下降,其中,25%组显著低于13%组(P<0.05)。13%、16%ADF组的空肠、盲肠和结肠pH均显著低于19%、22%和25%ADF组(P<0.05)。随日粮ADF水平升高,粗纤维消化率逐渐下降(P<0.05),粗蛋白质、粗脂肪和能量消化率先增加后降低(P<0.05),分别以19%和16%ADF组最高。随日粮ADF水平升高,平均日采食量逐渐增加;日增重先增加后降低,以19%ADF组最高,为31.43 g/d。综合分析,断奶至2月龄肉兔适宜的ADF水平为19%。

Effects of acid detergent fiber level on gut health,nutrients digestibility and growth performance in weaned rabbit

One hundred 35-day-old weaned rabbits with similar body weight were randomly divided into 5 groups,in which they were fed diet with different acid detergent fiber(ADF)levels(13 %,16 %,19 %,22 % and 25 %,respectively) to discuss the appropriate requirements of ADF in growing meat rabbits.The results showed as follows:the gut health of experiment rabbits was influenced greatly by dietary ADF levels,the frequency of diarrhoea and health risk index of 13 % and 16 % ADF groups were higher than those of other groups,and the average duration of diarrhoea rabbits dropped significantly with increase of dietary ADF levels(P < 0.05).The intestinal pH of 13 % and 16 % ADF groups were significantly lower than those of other groups(P < 0.05).When ADF level increased,the digestibility of crude fiber(CF)decreased significantly(P < 0.05),the digestibility of crude protein(CP),ether extract(EE)and gross energy(GE)increased first and then descended(P < 0.05),and reached maximum when dietary ADF was 19 % and 16 % respectively.When average daily intake(ADI) level increased,the ADI raised gradually,the ADG raised then reduced and reached its maximum(31.43 g/d) when dietary ADF was 19 %.According to these results,the appropriate dietary ADF level for weaning to 2-month old meat rabbits was 19 %.