POULTRY NUTRITION AND FEED

Amino Acid Balance Pattern of Low Protein Diet in Rapidly-Growing Yellow-Feathered Chickens during 22 to 42 Days of Age and 43 to 63 Days of Age

  • WANG Weiwei ,
  • JIANG Shouqun ,
  • LIN Xiajing ,
  • WANG Yibing ,
  • DING Fayuan ,
  • CHENG Zhonggang
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  • 1. Guangdong Provincial 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;
    2. Academy of National Food and Strategic Reserves Administration, Beijing 100037, China

Received date: 2020-10-10

  Online published: 2021-06-10

Abstract

This experiment aimed to establish amino acid balance pattern of yellow-feathered chickens from 22 to 42 and 43 to 63 days of age, and provide scientific reference for low protein diet formulation technology. In two stage feeding experiments, one hundred and sixty-eight 22-day-old or 43-day-old healthy and well developed rapidly-growing yellow-feathered male chickens were both randomly allocated into 7 groups with 6 replicates per group and 4 chickens per replicate according to similar weight principle. Normal control (SD) group was standard group, and the crude protein level in low protein (LP) group was decreased by 3%, and its amino acid contents were the same as those in SD group. In low protein and low Lys (LP-Lys), low protein and low Met (LP-Met), low protein and low Trp (LP-Trp), low protein and low Thr (LP-Thr) and low protein and low Ile (LP-Ile) groups, the levels of Lys, Met, Trp, Thr and Ile were reduced by 20% on the basis of LP group, respectively, while the levels of other amino acids remained unchanged. Feeding experiment and nitrogen balance experiment were used, and two stage feeding experiments lasted for 21 days. The results showed as follows:1) there were significant effects of amino acid balance pattern of low protein diet on final body weight (FBW) and average daily gain (ADG) of yellow-feathered chickens during two stage feeding experiments (P<0.05). From 22 to 42 days of age, FBW in LP group was significantly lower than that in the other 5 experimental groups except for LP-Ile group (P<0.05), ADG in LP group was significantly lower than that in the other 4 experimental groups except for LP-Met and LP-Ile groups (P<0.05), and the ratio of feed to gain in SD group was the lowest and was significantly lower than that in the other 3 experimental groups except for LP-Met, LP-Thr and LP-Trp groups (P<0.05). From 43 to 63 days, FBW and ADG in LP-Met group were significantly higher than those in LP, LP-Lys and LP-Trp groups (P<0.05). 2) Percentage of breast muscle of yellow-feathered chickens in LP-Met group was the highest and was significantly higher than that in LP-Thr and LP-Ile groups (P<0.05). 3) There were no significant effects of amino acid balance pattern of low protein diet on meat quality of yellow-feathered chickens at 63 days of age (P>0.05). 4) Nitrogen retention rate of yellow-feathered chickens from 22 to 42 days of age in LP-Lys group was the highest and was significantly higher than that in SD, LP-Thr, LP-Trp and LP-Ile groups (P<0.05), and nitrogen retention rate in SD group was significantly lower than that in the other groups from 43 to 63 days of age (P<0.05). On the basis of growth performance and nitrogen retention rate considered, the optimal amino acid ratio is 100 Lys:55.6 Met:97.2 Thr:25.0 Trp:95.8 Ile for rapidly-growing yellow-feathered chickens from 22 to 42 days of age. On the basis of growth performance, percentage of breast muscle and nitrogen retention rate considered, the optimal amino acid ratio is 100 Lys:37.3 Met:85.3 Thr:22.7 Trp:85.3 Ile, and dietary crude protein level can be reduced to 13% from 43 to 63 days of age.

Cite this article

WANG Weiwei , JIANG Shouqun , LIN Xiajing , WANG Yibing , DING Fayuan , CHENG Zhonggang . Amino Acid Balance Pattern of Low Protein Diet in Rapidly-Growing Yellow-Feathered Chickens during 22 to 42 Days of Age and 43 to 63 Days of Age[J]. Chinese Journal of Animal Nutrition, 2021 , 33(6) : 3198 -3209 . DOI: 10.3969/j.issn.1006-267x.2021.06.022

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