Effects of Dietary Threonine Levels on Growth Performance, Carcass Quality, Fat Metabolism and Immune Function of Yellow-Feathered Broilers from 1 to 21 Days of Age

LIN Xiajing; XI Pengbin; WANG Yibing; FAN Qiuli; CHENG Zhonggang; DING Fayuan; ZHENG Chuntian; JIANG Shouqun

doi:10.3969/j.issn.1006-267x.2021.04.021

2021 , Vol. 33 >Issue 4: 2013 - 2023

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.04.021

Effects of Dietary Threonine Levels on Growth Performance, Carcass Quality, Fat Metabolism and Immune Function of Yellow-Feathered Broilers from 1 to 21 Days of Age

LIN Xiajing ,
XI Pengbin ,
WANG Yibing ,
FAN Qiuli ,
CHENG Zhonggang ,
DING Fayuan ,
ZHENG Chuntian ,
JIANG Shouqun

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Guangdong Key Laboratory of Animal Breeding and Nutrition, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, State Key Laboratory of Livestock and Poultry Breeding, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

Received date: 2020-09-25

Online published: 2021-04-15

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Abstract

The purpose of this study was to determine the appropriate threonine requirement for yellow-feathered broilers from 1 to 21 days of age by studying the effects of dietary threonine levels on growth performance, carcass quality, fat metabolism and immune function. A total of 2 000 Lingnan fast-growing yellow-feathered broilers of 1-day-old were selected and randomly divided into 5 groups with 8 replicates (half male and half female) in each group and 50 chickens in each replicate. The experimental chickens in 5 groups were fed diets containing 0.60% (basal diet), 0.67%, 0.74%, 0.81% and 0.88% threonine for 21 days, respectively. The results showed as follows:1) dietary threonine levels significantly affected the final body weight, the average daily gain (ADG), the average daily feed intake (ADFI) and the ratio of feed to gain (P<0.05). The ADG and ADFI of yellow-feathered hens in 0.88% threonine level group were the highest, while the ADG and ADFI of yellow-feathered roosters in 0.74% threonine level group were the highest. According to the growth performance indices and regression analysis results, the optimal threonine level in the diet for yellow-feathered hens was 0.81%, and that for yellow-feathered roosters was 0.79%. 2) Dietary threonine levels significantly affected the half-eviscerated yield percentage, the eviscerated yield percentage and the leg muscle rate of yellow-feathered hens and roosters (P<0.05). The half-eviscerated yield percentage and the eviscerated yield percentage of yellow-feathered hens in 0.88% threonine level group were the highest, and the leg muscle rate of yellow-feathered hens in 0.74% threonine level group was the highest; the half-eviscerated yield percentage of yellow-feathered roosters in 0.81% threonine level group was the highest, and the eviscerated yield percentage and the leg muscle rate of yellow-feathered roosters in 0.74% threonine level group were the highest. According to the carcass quality indices and regression analysis results, the optimal threonine level in the diet for yellow-feathered roosters was 0.77%, and that for yellow-feathered hens was 0.88%. 3) Dietary threonine levels significantly affected the thymus index of yellow-feathered hens and roosters (P<0.05). The thymus index of yellow-feathered hens and roosters in 0.88% threonine level level group was the highest. 4) Dietary threonine levels had significant effects on the contents of triglyceride (TG), immunoglobulin G (IgG), interleukin-6 (IL-6) and insulin (INS) in serum of yellow-feathered hens (P<0.05), the serum contents of TG and INS in 0.88% threonine level group was the lowest, and the serum contents of IL-6 and IgG in 0.88% threonine level group was the highest. Dietary threonine levels had significant effects on the contents of low-density lipoprotein, INS, IL-6 and IgG in serum of yellow-feathered roosters (P<0.05), the serum contents of LDL and INS in 0.88% threonine level group was the lowest, and the serum contents of IL-6 and IgG in 0.88% threonine level group was the highest. 5) Dietary threonine levels significantly affected T lymphocyte proliferation rate in blood of yellow-feathered broilers (P<0.05). The T lymphocyte proliferation rate in blood of both male and female yellow-feathered broilers in 0.81% threonine level group was the highest. In conclusion, appropriate dietary threonine level can improve the growth performance, carcass quality and immune function of yellow-feathered broilers. According to the growth performance, the optimal threonine level in the diet for yellow-feathered female and male broilers from 1 to 21 days of age is 0.81% and 0.79%, respectively.

Key words： yellow-feathered broilers; threonine; growth performance; carcass quality; immune function; nutrient requirement

Cite this article

LIN Xiajing , XI Pengbin , WANG Yibing , FAN Qiuli , CHENG Zhonggang , DING Fayuan , ZHENG Chuntian , JIANG Shouqun . Effects of Dietary Threonine Levels on Growth Performance, Carcass Quality, Fat Metabolism and Immune Function of Yellow-Feathered Broilers from 1 to 21 Days of Age[J]. Chinese Journal of Animal Nutrition, 2021 , 33(4) : 2013 -2023 . DOI: 10.3969/j.issn.1006-267x.2021.04.021

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