动物营养学报2026，Vol.38Issue(5)：3362-3373,12.DOI:10.12418/CJAN2026.269
饲粮蛋白净能比对断奶仔猪生长性能、肠道消化吸收功能及空体蛋白质沉积的影响
Effects of Dietary Protein∶Net Energy Ratio on Growth Performance,Intestinal Digestion and Absorption Function and Empty Body Protein Deposition of Weaned Piglets
摘要
Abstract
This experiment was conducted to study the effects of dietary protein∶net energy ratio on growth performance,intestinal digestion and absorption function and empty body protein deposition of weaned piglets.Eighty"Duroc×Landrace×Yorkshire"weaned piglets with body weight of(6.85±0.51)kg were selected.Five piglets were randomly selected for comparative slaughter on day 1,while the remaining 75 were randomly di-vided into 5 groups(groups Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ),with 5 replicates per group and 3 piglets per replicate.The duration of the experiment was 42 d.The entire experiment was divided into 4 growth stages according to body weight:7 to 11 kg,11 to 15 kg,15 to 20 kg and 20 to 25 kg.The protein∶net energy ratio of the diet in each group was different,where group II adopted the recommended value from NRC(2012).For 7 to 11 kg piglets,the protein∶net energy ratios in diets of groups Ⅰ to Ⅴ were 20.96,20.06,19.26,18.52 and 17.83 g/MJ,respectively.For the three growth stages of 11 to 15 kg,15 to 20 kg and 20 to 25 kg,the dietary protein∶net energy ratios of groups Ⅰ to Ⅴ were 19.45,18.70,17.99,17.34 and 16.73 g/MJ,respectively.The results showed as follows:1)for the overall experimental period,with the decrease of dietary protein∶net energy ratio,the average daily gain and average daily feed intake of piglets showed a significant linear decrease(P＜0.05).2)The jejunal trypsin activity showed a significant linear decrease with the decrease of dietary pro-tein∶net energy ratio(P＜0.05),and the trypsin activity in the groups Ⅰ and Ⅱ was significantly higher than that in the group Ⅴ(P＜0.05).3)The ileal villus height showed a significant linear increase with the decrease of dietary protein∶net energy ratio(P＜0.05).4)The mRNA relative expression levels of ileal mucosal amino acid transporters-solute carrier family 6 member 19(SLC6A19)and solute carrier family 7 member 7(SLC7A7)showed a significant linear decrease with the decrease of dietary protein∶net energy ratio(P＜0.05),and the mRNA relative expression level of SLC6A19 in the group Ⅴ was significantly lower than that in the group Ⅰ(P＜0.05).5)With the decrease of protein∶net energy ratio,the empty body protein content,protein deposition and amino acid contents such as threonine,valine,lysine,histidine,aspartic acid,serine,glutamic acid and tyrosine showed a significant linear decrease(P＜0.05).The content and deposition of empty body protein in group Ⅰ were significantly higher than those in group Ⅴ(P＜0.05).The contents of methio-nine,isoleucine,leucine,phenylalanine,histidine,serine and tyrosine of empty body in the groups Ⅰ and Ⅱwere significantly higher than those in the group Ⅴ(P＜0.05).In conclusion,under the conditions of this ex-periment,when dietary protein∶net energy ratios are 18.52 and 17.34 g/MJ for weaned piglets at the 7 to 11 kg and 11 to 25 kg stages,respectively,these ratios can maintain growth performance,intestinal digestive enzyme activities,intestinal morphology and amino acid transporter expression,while achieving a relatively high empty body protein content and deposition efficiency.[Chinese Journal of Animal Nutrition,2026,38(5):3362-3373]关键词
蛋白净能比/断奶仔猪/消化酶活性/氨基酸转运载体/蛋白质沉积Key words
protein∶net energy ratio/weaned piglets/digestive enzyme activities/amino acid transporters/protein deposition分类
农业科技引用本文复制引用
康丽悦,李文强,郝晓冉,李建平,单安山..饲粮蛋白净能比对断奶仔猪生长性能、肠道消化吸收功能及空体蛋白质沉积的影响[J].动物营养学报,2026,38(5):3362-3373,12.基金项目
国家重点研发计划(2021YFD1300402) （2021YFD1300402）
