Efeito dos n赤veis de energia e programas de alimenta o sobre a qualidade de carca a e desempenho de frangos de corte abatidos tardiamente = Effect of metabolizable energy levels and feeding programs on carcass quality and performance in broilers slaugthered lately

作者：Karina Ferreira Duarte; Otto Mack Junqueira; Rosemeire da Silva Filardi; Antonio Carlos de Laurentiz

来源：Acta Scientiarum - Animal Sciences, 2007.

• aminoacidos digestiveis
• analise sensorial
• energia metabolizavel
• frangos de corte
• qualidade de carne
• digestible amino acids
• sensory analysis
• metabolizable energy
• broilers
• meat quality

O experimento foi realizado com o objetivo de avaliar diferentes n赤veis de energia e programas de alimenta o sobre a qualidade de carca a e carne de frangos de corte entre 42 e 57 dias de idade. Foram utilizados 1.600 pintos machos ※Cobb§, em um delineamento inteiramente ao acaso, em esquema fatorial 2x4, sendo dois n赤veis de energia (3.200 e 3.600 kcal EM kg-1) e quatro programas de alimenta o (recomenda es de amino芍cidos). Foram avaliados ascaracter赤sticas de carca a (rendimento de carca a, de peito e de coxas + sobrecoxas) e carne (cor, pH, perdas por coc o, for a de cisalhamento, capacidade de reten o de 芍gua e an芍lise sensorial)e os dados de desempenho (ganho de peso, consumo de ra o, convers o alimentar e convers o cal車rica). Os n赤veis energ谷ticos ou os diferentes programas de alimenta o n o determinaram diferen as expressivas na qualidade da carca a ou de carne que justifiquem a escolha de um n赤vel de energia ou de um programa alimentar, devendo prevalecer o n赤vel energ谷tico e as recomenda es de amino芍cidos que determinem o maior custo-benef赤cio. Observou-se que o n赤vel de 3.600 kcal EM kg-1 proporcionou melhoria no desempenho das aves, enquanto que o fracionamento das exig那ncias de amino芍cidos digest赤veis em dois per赤odos determinou piores resultados. This experiment was conducted to evaluate the use of different energy levels and amino acid recommendations on carcass and meat quality of broilers from 42 to 57 days of age. It was used 1,600 one-day old male broilers (Cobb) in a completely randomized design arranged in a factorial scheme 2x4 with 3,200 and 3,600 kcal ME kg-1 and four different feed programs. The experimental period was from 42 to 57 days of age. From 1 to 41 days of age all birds received the same diets based on corn and soybean meal. Data from carcass yield (output carcass, relation weight breast and thigh and overthigh with the carcass weight) and muscle quality (color, pH, cooking weight loss,shearing force, water holding capacity and sensorial analysis) and data from performance (weight gain, feed intake, feed:gain ratio and energy conversion) were evaluated. The energy levels and different feed programs did not determine differences on carcass meet quality tojustify the choice of amino acid levels and need to consider the energy levels and amino acid recommendations to determine the best cost-benefit. It was observed that 3,600 kcal ME kg-1 resulted in some improvement on performance, and the partition of digestible amino acid requirements during two periods resulted in worst performance.