Effects of Supplementing Limiting Amino Acids in Low Crude Protein Diets on Growth Performance and Nitrogen Emission of Dawu Golden Phoenix Laying Hens during Incubation Period

GENG Shunju, ZHANG Xiaoyi, ZHANG Jianyun, ZHAO Lihong, JI Cheng, MA Qiugang

doi:10.3969/j.issn.1006-267x.2019.01.021

2019 , Vol. 31 >Issue 1: 159 - 166

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.01.021

Molecular Nutrition

Effects of Supplementing Limiting Amino Acids in Low Crude Protein Diets on Growth Performance and Nitrogen Emission of Dawu Golden Phoenix Laying Hens during Incubation Period

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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2018-06-13

Online published: 2019-01-16

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Abstract

The purpose of this study was to investigate the effects of supplementing limiting amino acids in low crude protein diets on growth performance and nitrogen emission of Dawu Golden Phoenix laying hens during the incubation period. A total of 384 one-day-old Dawu Golden Phoenix laying hens were randomly divided into 4 groups with 6 replicates in each group and 16 hens in each replicate. Based on the limiting amino acid content in control group, dietary crude protein levels in other groups were decreased, and added limiting amino acids (methionine, lysine and threonine) to achieve crude protein levels of 20.02%, 19.39%, 18.44% and 17.36% (measured value). The other nutrition levels in the diets meet the requirements of NY/T 33-2004. The trial lasted for 6 weeks (1 to 6 weeks of age), and from the end of 6 weeks of age, an observation period lasted until 20 weeks of age. The results showed as follows:1) the average daily feed intake, average daily gain and final body weight of 18.44% and 17.36% crude protein groups had no significant difference (P>0.05), but were significantly higher than those of 20.02% crude protein group (P<0.05) except for average daily feed intake of 18.44% crude protein group. As dietary crude protein levels decreased, supplementing limiting amino acids linearly increased the average daily feed intake, average daily gain and final body weight (P<0.05), but there was no significant difference between the 20.02% and 19.36% crude protein groups (P>0.05). The 18.44% crude protein group had the best body weight uniformity. During the observation period, the body weight of 18.44% crude protein group had been at the top of the list. 2) The length of the jejunum and ileum of 18.44% crude protein group was significantly higher than that of 20.02% crude protein group, but there was no significant difference of 17.36% crude protein group (P>0.05). 3) The apparent retention rate of crude protein in 18.44% crude protein group was significantly higher than that of 20.02% and 19.39% crude protein groups (P<0.05). The nitrogen emission rate and nitrogen emission of 18.44% crude protein group were significantly lower than those of 20.02% crude protein group (P<0.05). Considering the growth performance and nitrogen emission, reducing dietary crude protein levels and supplementing limiting amino acids not only facilitate the growth but also improve nitrogen utilization.

Key words： low crude protein diet; Dawu Golden Phoenix laying hens; limiting amino acids; growth performance; nitrogen emission

Cite this article

GENG Shunju, ZHANG Xiaoyi, ZHANG Jianyun, ZHAO Lihong, JI Cheng, MA Qiugang . Effects of Supplementing Limiting Amino Acids in Low Crude Protein Diets on Growth Performance and Nitrogen Emission of Dawu Golden Phoenix Laying Hens during Incubation Period[J]. Chinese Journal of Animal Nutrition, 2019 , 31(1) : 159 -166 . DOI: 10.3969/j.issn.1006-267x.2019.01.021

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