POULTRY NUTRITION

The Optimal Levels of Metabolizable Energy, Crude Protein, Methionine and Lysine of Arbor Acres×Roman Hybrid Broilers of 22 to 56 Days of Age

  • CHU Huanhuan ,
  • BI Huijuan ,
  • SONG Yuqin ,
  • SI Qianqian ,
  • WANG Shubai
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  • College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China

Received date: 2015-05-17

  Online published: 2015-11-21

Abstract

This experiment was conducted to study the optimal levels of metabolizable energy (ME), crude protein (CP), methionine (Met) and lysine (Lys) of Arbor Acres (AA)×Roman hybrid broilers of 22 to 56 days of age. A total of 684 22-day-old healthy AA×Roman hybrid broilers were randomly allocated to 9 treatments with 6 replicates per treatment, and orthogonal test with four factors and three levels was designed, the level of ME was designed with 12.12, 12.54 and 12.96 MJ/kg, the level of CP was designed with 18%, 19% and 20%, the level of Met was designed with 0.40%, 0.45% and 0.50%, and the level of Lys was designed with 0.90%, 1.00% and 1.10%, then nine kinds of experimental diet were used. The effects of different nutrient levels on the growth performance, body composition, nutrient deposition rate and serum biochemical indexes of broilers were detected. The test lasted for 34 days. The results showed as follows:1) the ratio of feed to gain (F/G) of 12.96 MJ/kg ME treatment was significantly lower than that of 12.12 MJ/kg ME treatment (P<0.05). Average daily gain (ADG) and average daily feed intake (ADFI) of 20% CP treatment were higher than those of 19% and 18% CP treatments, while there was no significant difference between them (P>0.05). ADFI and F/G of 0.50% Met treatment were significantly lower than those of 0.40% Met treatment (P<0.05). ADG of 1.00% Lys treatment was significantly higher than that of 0.90% Lys treatment (P<0.05). 2) The ME level of diets had no significant effect on contents of broiler body component (P>0.05). The body fat content of 18% CP treatment was significantly higher than that of 20% CP treatment (P<0.05). Body Lys content of 0.45% Met treatment was significantly higher than that of 0.50% Met treatment (P<0.05), the body Lys content of 1.10% Lys treatment was significantly higher than that of 0.90% (P<0.01) and 1.00% Lys treatments (P<0.05). 3) The protein deposition rate of 12.96 MJ/kg ME treatment was significantly higher than that of 12.12 MJ/kg ME treatment (P<0.05), the protein deposition rate of 18% CP treatment was significantly higher than that of 19% CP treatment (P<0.05), the Met deposition rates of 0.40% and 0.45% Met treatments were significantly higher than that of 0.50% Met treatment (P<0.01). 4) The levels of ME, CP, Met and Lys in diet had no significant effect on the serum biochemical indexes of AA×Roman hybrid broilers (P>0.05). The result of regression analysis shows that the optimal levels of ME, CP, Met and Lys in diet for AA×Roman hybrid broilers of 56 days of age are 12.81 MJ/kg, 18.11%, 0.46% and 1.02%, respectively.

Cite this article

CHU Huanhuan , BI Huijuan , SONG Yuqin , SI Qianqian , WANG Shubai . The Optimal Levels of Metabolizable Energy, Crude Protein, Methionine and Lysine of Arbor Acres×Roman Hybrid Broilers of 22 to 56 Days of Age[J]. Chinese Journal of Animal Nutrition, 2015 , 27(11) : 3381 -3390 . DOI: 10.3969/j.issn.1006-267x.2015.11.009

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