One thousand andfifty (1,050) Ross male broilers from 23 to 36 days of age were used to evaluatethe dietary effects of levels of lysine. It was used a random block design with5 levels of digestible lysine (0.95; 1.00; 1.05; 1.10 and 1.15%). Each levelwas applied to seven replicates and the experimental unit was composed of 30birds. Diets were offered in seven replicates and the experimental unit wasrepresented by 30 birds. Weight gain, feed intake, feed conversion, carcasstraits, cut yields, composition and deposition of body nutrients were evaluated.The concentration of 1.09% of digestible lysine optimized performance withoutsignificant effects on feed intake. Carcass traits and cut yields had no significantdifferences among levels of lysine. On the other hand, there was a quadraticeffect on carcass weight, which was the best at the level of 1.07% of digestiblelysine. On crude protein content of the empty body, the best response was observedat the level of 1.10% of dietary lysine. This same level corresponded to a quadraticresponse in the deposition of water from carcass and empty body. The level ofdigestible lysine for better performance, chemical composition and body nutrientdeposition in broilers from 23 to 36 days of age is between 1.07 and 1.10%.
