Effects of Dietary Metabolizable Energy and Crude Protein Levels on Growth Performance and Serum Biochemical Indexes in Beijing You Chicken New Line Aged from 1 to 6 Weeks

GENG Ailian; WANG Haihong; ZHANG Fan; CHU Qin; ZHANG Jian; YAN Zhixun; CAO Jing; ZHANG Xiaoyue; LIU Huagui

doi:10.3969/j.issn.1006-267x.2021.08.020

2021 , Vol. 33 >Issue 8: 4395 - 4404

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.08.020

POULTRY NUTRITION AND FEED

Effects of Dietary Metabolizable Energy and Crude Protein Levels on Growth Performance and Serum Biochemical Indexes in Beijing You Chicken New Line Aged from 1 to 6 Weeks

GENG Ailian ,
WANG Haihong ,
ZHANG Fan ,
CHU Qin ,
ZHANG Jian ,
YAN Zhixun ,
CAO Jing ,
ZHANG Xiaoyue ,
LIU Huagui

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Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

Received date: 2021-01-08

Online published: 2021-08-11

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Abstract

This experiment was conducted to study the effects of metabolizable energy (ME) and crude protein (CP) levels on growth performance and serum biochemical indexes in Beijing You chicken (BYC) new line aged from 1 to 6 weeks, and to determine the optimum dietary ME and CP levels, so as to provide a basis for formulating feeding standard of BYC new line. A 3×3 factorial design was adopted, ME levels were 11.92, 12.12 and 12.32 MJ/kg, CP levels were 18%, 19% and 20%. A total of 1 296 one-day-old commercial BYC new line chickens with similar body weight and mixed gender were randomly allocated to 9 groups with 9 replicates per group and 16 chickens per replicate (cage). The birds were randomly subjected to one of the 9 experimental diets. Growth performance were measured aged from 1 to 3 weeks, 4 to 6 weeks and 1 to 6 weeks, serum biochemical and antioxidant indexes were measured at week 6. The results showed as follows:1) ME and CP levels had no significant effects on the growth performance of chicks aged from 1 to 3 weeks, 4 to 6 weeks and 1 to 6 weeks (P>0.05), however, the interaction of ME and CP had significant effects on feed gain ratio of chicks aged from 1 to 6 weeks, 12.12 MJ/kg ME and 19% CP had the lowest feed gain ratio among groups (P<0.05). 2) Serum albumin content was significantly affected by ME levels, and the albumen content in the 11.92 MJ/kg group was significantly higher than that in 12.12 and 12.32 MJ/kg groups (P<0.05). The serum total protein and globulin contents were significantly affected by CP levels, which increased with the increase of CP level. 3) Dietary CP level significantly affected the serum total antioxidant capacity of chicks aged 6 weeks, among which 20% group was significantly higher than 18% group (P<0.05), while there were no significant differences between 19% and the other two levels (P>0.05). In conclusion, considering the performance and the serum biochemical indexes, the optimum ME and CP levels are 12.12 MJ/kg and 19% for BYC new line chicken aged from 1 to 6 weeks of age.

Key words： Beijing You chicken; ME; CP; growth performance; biochemical indexes

Cite this article

GENG Ailian , WANG Haihong , ZHANG Fan , CHU Qin , ZHANG Jian , YAN Zhixun , CAO Jing , ZHANG Xiaoyue , LIU Huagui . Effects of Dietary Metabolizable Energy and Crude Protein Levels on Growth Performance and Serum Biochemical Indexes in Beijing You Chicken New Line Aged from 1 to 6 Weeks[J]. Chinese Journal of Animal Nutrition, 2021 , 33(8) : 4395 -4404 . DOI: 10.3969/j.issn.1006-267x.2021.08.020

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