Effects of Low-Protein Diet Supplemented with Glutamate on Protein Utilization and Performance of Finishing Pigs

ZHEN Jifu, Xu Qingqing, Li Mao, SUN Zhihong

doi:10.3969/j.issn.1006-267x.2018.02.014

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 2: 507 - 514

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.02.014

Molecular Nutrition

Effects of Low-Protein Diet Supplemented with Glutamate on Protein Utilization and Performance of Finishing Pigs

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1. Laboratory of Bio-Feed and Molecular Nutrition, Southwest University, Chongqing 400715, China;
2. College of Animal Science and Technology, Southwest University, Chongqing 400715, China

Received date: 2017-07-24

Online published: 2018-02-02

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Abstract

The aim of this study was to evaluate the effects of low-protein diet supplemented with glutamate (Glu) on the protein utilization and performance of finishing pigs. In experiment 1, six "Duroc×Landrace×Yorkshire" three-way hybrid castrated boars with body weight of (54.2±1.0) kg were used in a 3×3 replicated Latin square trial to investigate the effects of dietary Glu on nitrogen balance. The experiment included 3 periods with 7 days per period. The 3 diets with different levels of crude protein (CP) were 14.0% CP (control group), 12.5% CP+Glu and 11.0% CP+Glu. Experiment 2 was a feeding test, thirty "Duroc×Landrace×Yorkshire" three-way hybrid castrated boars with body weight of (57.4±0.2) kg were randomly assigned to 3 groups with 10 replicates per group and 1 pig per replicate by completely randomized block design. The experimental diets were same as experiment 1. The experiment 2 lasted for 35 days. The results showed as follows:1) compared with control group, low-protein diet supplemented with Glu significantly decreased the total nitrogen intake, urinary nitrogen and the total nitrogen losses of finishing pigs (P<0.05). Nitrogen biological value in 11.0% CP+Glu group was significantly higher than that in control group (P<0.05). 2) Compared with control group, low-protein diet supplemented with Glu had no significant effects on final body weight and average daily gain (ADG) (P<0.05), but significantly decreased CP intake and the ratio of average daily CP intake to ADG (P<0.05). 3) Compared with control group, low-protein diet supplemented with Glu significantly decreased the contents of glucose, urea nitrogen and free fatty acids in plasma of finishing pigs (P<0.05). 4) The contents of glucose and pyruvic acid in jejunal mucosa of finishing pigs in 11.0% CP+Glu group were significantly higher than those in control group (P<0.05), and the content of actic acid in jejunal mucosa in 11.0% CP+Glu and 12.5% CP+Glu groups was significantly lower than that in control group (P<0.05). In conclusion, low-protein diet supplemented with Glu can decrease urinary nitrogen and the total nitrogen losses, improve protein utilization and has no significant effect on performance of finishing pigs.

Key words： low-protein diet; finishing pig; nitrogen balance; performance; amino acid

Cite this article

ZHEN Jifu, Xu Qingqing, Li Mao, SUN Zhihong . Effects of Low-Protein Diet Supplemented with Glutamate on Protein Utilization and Performance of Finishing Pigs[J]. Chinese Journal of Animal Nutrition, 2018 , 30(2) : 507 -514 . DOI: 10.3969/j.issn.1006-267x.2018.02.014

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