Effects of Metabolizable Energy and Crude Protein Levels on Performance, Slaughter Performance and Serum Biochemical Indexes in Cobb Broilers

CAO Zan, GAO Zhenhua, CHEN Guangxin, LI Qiuping, CHEN Caiwen, ZHANG Shaocheng, HUANG Zhipeng, DING Zhipeng

doi:10.3969/j.issn.1006-267x.2014.09.015

2014 , Vol. 26 >Issue 9: 2553 - 2564

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.09.015

Poultry Nutrition

Effects of Metabolizable Energy and Crude Protein Levels on Performance, Slaughter Performance and Serum Biochemical Indexes in Cobb Broilers

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1. College of Agriculture, Guangdong Ocean University, Zhanjiang 524088, China;
2. Animal Health Authority of Suzhou, Suzhou 234000, China

Received date: 2014-05-16

Online published: 2014-09-10

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Abstract

This study was conducted to investigate the best combination effects of metabolizable energy and crude protein levels for broilers aged from 1 to 21 days by two factors quadratic regression orthogonal rotation combination design. A total of 480 one-day-old Cobb broilers were randomly divided into 12 groups with 4 replicates per group and 10 broilers (male and female in half) per replicate. Groups 1 to 8 were experiment groups, and groups 9 to 12 were center groups (0 level groups). The experiment lasted for 21 d. With metabolizable energy and crude protein levels as independent variables, the indexes of production performance and slaughter performance were as the dependent variable to fit regression equations. The results showed that metabolizable energy and crude protein levels had significant effects on average daily gain (ADG), the ratio of feed to gain (F/G), breast muscle percentage, thigh muscle percentage and abdominal fat percentage of broilers aged from 1 to 21 days (P<0.05). The response graphs and regression analysis showed as follows: when metabolizable energy level was from 10.05 to 12.40 MJ/kg, the ADG was increased with the increase of crude protein level, the effect became weak gradually with the crude protein level further increasing; when metabolizable energy and crude protein levels were 11.80 MJ/kg and 22.85%, respectively, the average daily feed intake (ADFI) was the maximum; when the metabolizable energy level was 12.15 MJ/kg and crude protein level was 20.65%, the F/G was the minimum (1.65); when the metabolizable energy and crude protein levels were at the time of 12.05 to 12.15 MJ/kg and 20.85% to 21.25%, respectively, the breast muscle percentage and thigh muscle percentage were higher, while the abdominal fat percentage was lower. Overall, when dietary metabolizable energy and crude protein levels are 12.05 to 12.45 MJ/kg and 20.65% to 21.25%, broiler performance and slaughter performance are the best.

Key words： metabolizable energy; crude protein; broiler; performance; quadratic regression orthogonal rotation combination design; 3D-response surface

Cite this article

CAO Zan, GAO Zhenhua, CHEN Guangxin, LI Qiuping, CHEN Caiwen, ZHANG Shaocheng, HUANG Zhipeng, DING Zhipeng . Effects of Metabolizable Energy and Crude Protein Levels on Performance, Slaughter Performance and Serum Biochemical Indexes in Cobb Broilers[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2553 -2564 . DOI: 10.3969/j.issn.1006-267x.2014.09.015

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