Standard Ileum Digestible Total Sulfur Amino Acids to Lysine Ratio in Low Protein Diet for Laying Hens

GUO Dan, WANG Jing, QI Guanghai, ZHANG Tao, GAO Jun, ZHANG Haijun, WU Shugeng

doi:10.3969/j.issn.1006-267x.2019.01.020

Chinese Journal of Animal Nutrition >

2019 , Vol. 31 >Issue 1: 148 - 158

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.01.020

Molecular Nutrition

Standard Ileum Digestible Total Sulfur Amino Acids to Lysine Ratio in Low Protein Diet for Laying Hens

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1. Key Open Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, The Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Evonik Degussa(China) Investment Co., Ltd., Beijing 100026, China

Received date: 2018-06-19

Online published: 2019-01-16

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Abstract

The experiment was conducted to evaluate the optimal total sulfur containing amino acid (TSAA) to lysine (Lys) ratio (TSAA/Lys) for laying hens fed low protein diets under standard ileal digestible amino acid (SID AA) pattern. Five hundred and forty Jinghong laying hens aged 30 weeks with 92% uniformity were randomly divided into 6 groups with 6 replicates containing 15 hens each. The corn-soybean meal was used in the experiment and the crude protein level was 16.5% as a common level in the control group with 91% TSAA/Lys, while the crude protein level (constant Lys content and increasing level of methionine) was 13.5% as a low level in the experimental groups with 85%, 88%, 91%, 94% and 97% TSAA/Lys, respectively. The experiment lasted for 10 weeks after 1 week adaption. The result showed as follows:1) under the SID AA pattern, average daily feed intake, egg production, average daily egg mass and average egg weight in the low protein group were significantly lower than those in the control group in each stage (P<0.05). The egg production was significantly increased with the TSAA/Lys increasing in the whole stage (P<0.05), which was the highest when the TSAA/Lys was 91%. The indices of egg quality and egg composition had no significant differences between the control group and the low protein group (P>0.05), but the yolk color in the low protein group was significantly deepened compared with the control group (P<0.05). The Haugh unit in the low protein group showed quadratic curve changes with the TSAA/Lys increasing (P<0.05). Compared with the control group, the plasma uric acid content of hens in the low protein group was significantly lower (P<0.05), and the plasma urea nitrogen content of hens in the low protein group tended to be lower (0.05 ≤ P<0.10). Higher plasma total protein content and lower contents of plasma uric acid and uric nitrogen were observed in the chickens fed diets with TSAA/Lys at 88% to 94% in the low protein group. 2) According to quadratic curve estimation based on egg production, the ratio of feed to egg and average daily egg mass, the optimal TSAA/Lys allowance for laying hens was 90.15%, 91.61% and 90.31%, respectively, which could be averaged to 90.69%. In conclusion, under the SID AA pattern, the optimal TSAA/Lys allowance for Jinghong laying hens of 30 to 40 weeks of age is 90.69% in the low protein diet.

Key words： low protein diet; standard ileal digestible amino acid; total sulfur-containing amino acid; lysine; Jinghong laying hen

Cite this article

GUO Dan, WANG Jing, QI Guanghai, ZHANG Tao, GAO Jun, ZHANG Haijun, WU Shugeng . Standard Ileum Digestible Total Sulfur Amino Acids to Lysine Ratio in Low Protein Diet for Laying Hens[J]. Chinese Journal of Animal Nutrition, 2019 , 31(1) : 148 -158 . DOI: 10.3969/j.issn.1006-267x.2019.01.020

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