动物营养学报2019，Vol.31Issue(6)：2579-2588,10.DOI:10.3969/j.issn.1006⁃267x.2019.06.017
低蛋白质饲粮中添加不同水平亮氨酸对育肥猪氮平衡的影响
Effects of Low?Protein Diets Supplemented with Different Levels of Leucine on Nitrogen Balance of Finishing Pigs
摘要
Abstract
This experiment was designed to investigate the effects of low?protein diets supplemented with differ?ent levels of leucine on nitrogen balance of finishing pigs, and to determine the appropriate level of leucine in low protein diets. In experiment, ten healthy " Duroc×Landrace×Yorkshire" three?way hybrid castrated boars with an initial body weight of (70.7±3.1) kg were allocated to one of five groups in a 5 × 5 Latin square de?sign and fed 5 test diets, including one normal protein diet ( contained 14.5% crude protein) and four low pro?tein diets ( contained 10.0% crude protein) supplemented with different levels (0, 0.4%, 0.8% and 1.2%) of leucine. The whole experimental period was 50 days, which was divided into 5 phases, each phase was 10 days. The first 5 days were the pre?test period, and the last 5 days were the collection period. Determination of nitrogen balance indexes in finishing pigs by full collection of feces and urine. The results showed that the re?duction of dietary protein level resulted in a significant decrease in nitrogen intake of finishing pigs ( P＜0.05) , followed by a significant decrease in nitrogen output and nitrogen retention ( P＜0.05) , but the nitrogen reten?tion rare of four low?protein diet groups was significantly higher than that of the normal protein diet group ( P＜0.05). When 0.4% leucine was added to the low protein diet, the nitrogen output was the lowest and the nitro?gen retention was the highest; while the leucine supplemental level was higher than 0.4%, the nitrogen reten?tion decreased significantly ( P＜0.05). At the same time, the total tract apparent digestibility of isoleucine and valine showed a decrease trend with the increase of leucine supplemental level. Based on above results, the op?timum supplemental level of leucine in the low?protein diet ( contained 10.0% crude protein) of finishing pigs should be 0.4%.[ Chinese Journal of Animal Nutrition, 2019, 31(6) :2579?2588]关键词
低蛋白质饲粮/亮氨酸/育肥猪/氮平衡Key words
low protein diet/leucine/finishing pigs/nitrogen balance分类
农业科技引用本文复制引用
黄烁,楚丽翠,王钢,王钰明,曾祥芳,谯仕彦..低蛋白质饲粮中添加不同水平亮氨酸对育肥猪氮平衡的影响[J].动物营养学报,2019,31(6):2579-2588,10.基金项目
农产品质量安全监管专项经费项目(131821301092361002) （131821301092361002）
2018年现代农业产业技术体系北京市创新团队建设项目——生猪 （）
