50头 2 1日龄断奶的胜利白猪随机分为 5组 ,Ⅰ组 (对照组 )为基础日粮组 ;Ⅱ ,Ⅲ ,Ⅳ组分别为基础日粮 +1 % ,2 % ,3 %小肽营养素 ;Ⅴ组为基础日粮 +2 %SDPP。试验期 2 8d。结果表明 ,添加 3 %小肽营养素后 ,仔猪平均日增重比对照组提高 33 67% (P <0 0 5) ,料重比下降8 4% (P <0 0 5)与添加 2 %SDPP的效果类似。添加小肽营养素后 ,仔猪十二指肠、空肠、回肠的绒毛长度增加、隐窝深度减小 ,这种趋势随着小肽营养素添加量的增加而提高。小肽营养素能刺激仔猪断奶后十二指肠食糜乳糖酶、淀粉酶、脂肪酶和胰蛋白酶的活性 ,以添加 3 %小肽营养素和 2 %SDPP效果较好。小肽营养素可促进断奶仔猪免疫系统发育 ,增加血液中IgG浓度 (P <0 0 5)。

male weaning Shengli White piglets were randomly divided into 5 groups.The piglets were fed with basal diet,basal diet+1%mini peptides(MP),basal diet+2%MP,basal diet+3%MP,basal diet+2%serum derived protein powder(sdpp)in GroupⅠ,Ⅱ,Ⅲ,Ⅳ and Ⅴ respectively for 28 days.Compared with the control,the average daily gain was increased by 33 67% (P<0 05) and the Feed:Body Weight was decreased by 8 4% (P<0 05) in GroupⅣ.After supplementing MP in diets,the villi heights of duodenum,jejunum and ileum were longer and the crypt depths were lower.This tendency became more evident when the adding rate of MP was elevated.Both MP and SDPP enhanced the activities of lactase,amylase,lipase and trypsin in duodenum chyme,with the best effects in GroupⅣand Ⅴ.In addition,MP could improve the development of piglets′immune system,increase the IgG concentration in serum and decrease the diarrhea rate.In conclusion,MP can improve the growth performance and the development of small intestines in weaning piglets.This effects were most significant after adding 3%MP to diets,which could be in replacement of 2%SDPP.