efeitos de planos nutricionais e de fontes de metionina sobre o desempenho, rendimento e composição de carcaças de frangos de corte effects of nutritional plans and methionine sources on broilers performance, carcass yield, and carcass composition

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ID: 204830
2009
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Abstract
Para avaliar os efeitos de dois diferentes planos nutricionais de aminoácidos sulfurados totais (AAST) e de duas fontes de metionina nas rações de frangos de corte, foi realizado um experimento com 840 frangos machos, da linhagem agRoss 308. Os tratamentos foram definidos pelos planos nutricionais de AAST (normal e reduzido) e pelas fontes de metionina (DL-metionina e metionina hidroxianáloga - MHA) usadas nas rações. O delineamento experimental foi o inteiramente ao acaso, em arranjo fatorial 2x2, (duas fontes de metionina x dois planos nutricionais de AAST). Não foram encontradas diferenças entre os tratamentos para o consumo de ração, ganho de peso, viabilidade, rendimento de carcaça, porcentagem de peito e composição das carcaças e vísceras. As aves que receberam as rações com o plano normal de AAST apresentaram melhor conversão alimentar, e as que receberam ração contendo DL-metionina tiveram menor porcentagem de gordura abdominal. Concluiu-se que a substituição da DL-metionina pela MHA não afetou o desempenho, que o plano nutricional normal melhorou a conversão alimentar dos frangos de corte e que as fontes de metionina e os planos nutricionais de AAST não influenciaram o rendimento e a composição da carcaça e vísceras de frangos de corte.
To evaluate the effects of two different nutritional plans for total sulfur amino acids (TSAA), and two methionine sources in the diets of broiler chickens, an experiment was conducted with 840 male broiler line agRoss 308. The treatments were defined by nutritional plans of TSAA (normal and low) and the methionine sources (DL-methionine and methionine hydroxy-analogue - MHA) used in the diets. The experimental design was completely randomized in a factorial scheme 2X2, (two methionine sources x two levels of nutrition plans TSAA). No differences were found between treatments for ration consumption, weight gain, viability, carcass yield, and carcass composition. The broilers that received the diets with the TSAA normal level had better feed conversion, and those that received diets containing DL-methionine had lower abdominal fat percentages. It was concluded that the substitution of DL-methionine by MHA did not affect the performance of broilers, whereas the normal nutrition plan improved feed conversion of broiler chickens as well as methionine sources and TSAA nutritional plans did not influence the carcass yield and carcass composition of broiler chickens.
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Authors ;R.S. Leite;J.S.R. Rocha;B.C. Michel;L.J.C. Lara;E.A. Ornelas;S.V. Cançado;N.C. Baião
Journal Environmental research
Year 2009
DOI
10.1590/S0102-09352009000500015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352009000500015
Keywords
broiler methionine carcassanimal culture methionine hydroxy-analogue

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