Dietary levels of lysine for male broilers from 23 to 36 days of age: performance and body composition

Abstract

-One thousand and fifty (1,050) Ross male broilers from 23 to 36 days of age were used to evaluate the dietary effects of levels of lysine. It was used a random block design with 5 levels of digestible lysine (0.95; 1.00; 1.05; 1.10 and 1.15%). Each level was applied to seven replicates and the experimental unit was composed of 30 birds. Diets were offered in seven replicates and the experimental unit was represented by 30 birds. Weight gain, feed intake, feed conversion, carcass traits, cut yields, composition and deposition of body nutrients were evaluated. The concentration of 1.09% of digestible lysine optimized performance without significant effects on feed intake. Carcass traits and cut yields had no significant differences among levels of lysine. On the other hand, there was a quadratic effect on carcass weight, which was the best at the level of 1.07% of digestible lysine. On crude protein content of the empty body, the best response was observed at the level of 1.10% of dietary lysine. This same level corresponded to a quadratic response in the deposition of water from carcass and empty body. The level of digestible lysine for better performance, chemical composition and body nutrient deposition in broilers from 23 to 36 days of age is between 1.07 and 1.10%.

Desempenho, características de carcaça e coeficientes de metabolizabilidade de frangos de corte sexados

“…Os avanços genéticos têm contribuído com melhoras nas taxas de crescimento, conversão alimentar e rendimento de carcaça de forma que a formulação de dietas para frangos de corte tornou-se um grande desafio. Uma vez que a expressão fenotípica do potencial genético depende do ambiente e da nutrição, é importante conhecer às exigências nutricionais das aves em processo de melhoramento para se obter o máximo desempenho das mesmas (TRINDADE NETO et al 2011).…”