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

Revista Brasileira de Zootecnia

Messias Alves Da Trindade Neto²  Ana Louise De Toledo¹  Paula Takeara¹  Estela Kobashigawa¹  Daniella Carolina Zanardo Donato¹  Ricardo De Albuquerque¹ 

[1] ,USP FMVZ Departamento de Nutrição e Produção Animal SP ,Brasil

关键词: digestible amino acid;    nutrient depositions;    nutrition;    requirement;    aminoácido digestível;    deposição de nutrientes;    exigência;    nutrição;   

DOI  :  10.1590/S1516-35982011000300020

来源: SciELO

【 摘 要 】

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%.

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