An experiment was carried out to evaluate digestible lysine requirement for male broilers chicks of Ross line from 1 to 11 days old. A total of 1050 one day old male chicks were fed with five isoenergetic (2,950 kcal ME/kg) and isoproteic (23% CP) diets, with digestible lysine levels of 1.12, 1.17, 1.22, 1.27 and 1.35%. A completely randomized bloc design was used with seven replications of 30 birds per experimental unit. A comparative slaughter technique was conducted to determine body nutrients depositions. A decreasing linear effects in final weight, weight gain, relative weight gain and feed intake were observed suggesting a probable amino acid excess in diet. The body chemical composition did not differ among birds, except for blood and offal ashes content, whish shown a quadratic response to digestible lysine levels in the diets. A decreasing linear response was observed for carcass water deposition. The best digestible lysine level for broilers from 1 to 11 days old must be equal to or lower than 1.12%, however further researches must be conducted with lower levels.
amino acid; nutrient deposition; nutrition; requirement
