Effects of Low-Protein Diets Supplemented with Different Levels of Leucine on Nitrogen Balance of Finishing Pigs

HUANG Shuo, CHU Licui, WANG Gang, WANG Yuming, ZENG Xiangfang, QIAO Shiyan

doi:10.3969/j.issn.1006-267x.2019.06.017

Chinese Journal of Animal Nutrition >

2019 , Vol. 31 >Issue 6: 2579 - 2588

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.06.017

Molecular Nutrition

Effects of Low-Protein Diets Supplemented with Different Levels of Leucine on Nitrogen Balance of Finishing Pigs

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1. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
2. Beijing Key Laboratory of Biological Feed Additives, Beijing 100193, China

Received date: 2018-12-11

Online published: 2019-06-17

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Abstract

This experiment was designed to investigate the effects of low-protein diets supplemented with different 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 design and fed 5 test diets, including one normal protein diet (contained 14.5% crude protein) and four low protein 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 reduction 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 retention 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 nitrogen retention was the highest; while the leucine supplemental level was higher than 0.4%, the nitrogen retention 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 optimum supplemental level of leucine in the low-protein diet (contained 10.0% crude protein) of finishing pigs should be 0.4%.

Key words： low protein diet; leucine; finishing pigs; nitrogen balance

Cite this article

HUANG Shuo, CHU Licui, WANG Gang, WANG Yuming, ZENG Xiangfang, QIAO Shiyan . Effects of Low-Protein Diets Supplemented with Different Levels of Leucine on Nitrogen Balance of Finishing Pigs[J]. Chinese Journal of Animal Nutrition, 2019 , 31(6) : 2579 -2588 . DOI: 10.3969/j.issn.1006-267x.2019.06.017

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