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Effect of different dietary concentrations of amino acids on the performance of two different broiler strains

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Effect of different dietary concentrations of amino acids on the performance of two different broiler strains

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Título Effect of different dietary concentrations of amino acids on the performance of two different broiler strains
Autor Ebling, Patricia Diniz
Ribeiro, Andrea Machado Leal
Trevizan, Luciano
Silva, Isabel Cristina Mello da
Kessler, Alexandre de Mello
Rubin, Lauricio Librelotto
Abstract Four Nutritional Programs (NP) used in the Brazilian poultry industry were tested in two broiler strains (Cobb 500 and Ross 308). NP varied in the concentrations of their main essential amino acids (AA) and were classified as Low, Regular, High and Mixed (high AA concentrations up to 21 days and regular concentrations after that). Minimum digestible Met+Cys/Lys, Thr/Lys, Arg/Lys, Ile/Lys, and Val/Lys ratios were 0.74, 0.64, 1.05, 0.65 and 0.75, respectively, in all NP, and no minimum amount of CP was fixed. There were no interactions between strain and NP for any of the evaluated responses. From 1 to 47 days of age, birds fed the Low NP presented lower average body weight and body weight gain (BWG). The high NP allowed for better feed conversion ratio (FCR), followed by the Regular and the Mixed NP. Ross 308 broilers were heavier, presenting worse FCR due to higher FI. Birds fed the High NP had lower carcass yield than those fed the Low NP. The Low and Regular NP had lower costs per WG when compared with the High NP. Low and Regular NP presented higher gross margin returns compared with the High NP. The Regular and Mixed NP are the most recommended, presenting intermediate performance and higher economic returns.
Contido em Revista brasileira de ciência avícola= Brazilian journal of poultry science. Campinas, SP. Vol. 15, n. 4 (out/dez 2013), p. 339-346
Assunto Frango de corte
Nutricao animal
[en] Brazilian nutritional programs
[en] Carcass yield
[en] Economic evaluation
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/107126
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