Effects of Valine Supplementation in Low-Protein Diets on Growth Performance, Slaughter Performance and Serum Indices of Broilers

CHEN Jiang, LIU Guohua, PIRZADO Shoaib Ahmed, CHEN Zhimin, ZHENG Aijuan, CHANG Wenhuan, CAI Huiyi, DONG Xiaoli

doi:10.3969/j.issn.1006-267x.2019.04.017

2019 , Vol. 31 >Issue 4: 1604 - 1612

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.04.017

Molecular Nutrition

Effects of Valine Supplementation in Low-Protein Diets on Growth Performance, Slaughter Performance and Serum Indices of Broilers

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1. Key Open Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. National Engineering Research Center for Biological Feed Development, Beijing 100081, China;
3. Xijie(Shanghai) Trading Co., Ltd., Shanghai 200335, China

Received date: 2018-09-05

Online published: 2019-04-16

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Abstract

The objective of this study was to investigate the effects of valine (Val) supplementation in low-protein diets on growth performance, slaughter performance and serum indices of broilers. A total of 300 one-day-old Arbor Acres broilers were randomly divided into 5 groups (groups Ⅰ to Ⅴ) with 6 replicates per group and 10 chickens per replicate. The recommended levels of crude protein in diets for broilers in the starter (1 to 21 days of age) and grower (22 to 42 days of age) phases were 19.55% and 17.67%, respectively. The dietary lysine (Lys) levels were 1.17% and 1.01% for the starter and grower phases, respectively. Dietary Val/Lys ratios were supplied with 68%, 73%, 78%, 83% and 88% for the starter and grower phases, respectively. The experiment lasted for 42 days. The results showed as follows:1) the Val supplementation in low-protein diets significantly increased the final body weight and average daily gain (P<0.05), but significantly decreased the feed/gain ratio (F/G) (P<0.05) of broilers from 1 to 42 days of age. When analyzed by quadratic regression model, the optimal Val/Lys ratios for ADG and F/G were 80.07% and 81.03%, respectively. 2) The Val supplementation in low-protein diets had no significantly different effects on slaughter rate, whole net carcass rate, breast muscle rate, leg muscle rate and abdominal fat rate of broilers (P>0.05). 3) Compared with group Ⅰ, the serum contents of total protein, albumin, globulin and the serum activates of total superoxide dismutase and catalase of broilers in groups Ⅱ to Ⅴ were not significantly different (P>0.05), but the serum uric acid content was decreased (0.05<P<0.10). The serum glucose content of broilers in groups Ⅱ, Ⅳ and Ⅴ was significantly higher than that in group Ⅰ (P<0.05), but there was no significant differences compared with group Ⅲ (P>0.05). The serum malondialdehyde content of broilers in groups Ⅲ and Ⅳ was significantly lower than that in groups Ⅰ and Ⅱ (P>0.05). The Val supplementation in low-protein diets had no significantly different effects on serum free amino acid contents of broilers (P>0.05). These results indicate that the Val supplementation in low-protein diets can improve the growth performance and antioxidant capacity of broilers. The recommended Val/Lys ratios to achieve maximum ADG and minimum F/G are 80.07% and 81.03%, respectively.

Key words： broilers; valine; growth performance; serum biochemical indices; serum free amino acids

Cite this article

CHEN Jiang, LIU Guohua, PIRZADO Shoaib Ahmed, CHEN Zhimin, ZHENG Aijuan, CHANG Wenhuan, CAI Huiyi, DONG Xiaoli . Effects of Valine Supplementation in Low-Protein Diets on Growth Performance, Slaughter Performance and Serum Indices of Broilers[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1604 -1612 . DOI: 10.3969/j.issn.1006-267x.2019.04.017

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