Lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira de um aos 28 dias (Digestible lysine in diets containing low protein concentrations for broiler type redneck from 1 to 28 days)

ABSTRACT The inclusion of different percentages of digestible lysine in low-protein diets was evaluated for male and female free-range broiler chickens, from 1 to 28 days. We used 792 female and 792 male naked neck chickens a day in a completely randomized 2x6 factorial scheme (sex x percentages of digestible lysine: 0.85, 0.90, 0.95, 1.00, 1.05 and 1.10%) with six replicates of 22 broilers. No interaction of sex versus lysine was found. Superiority was observed (P 0.05) in food conversion. In the chemical composition of the carcass, only the percentage of mineral matter was influenced (P<0.05) by digestible lysine levels. It was concluded that the level of 0.85% for type redneck broiler meets the nutritional requirement of digestible lysine in diets containing lower protein concentrations. Keywords: amino acids, broiler, carcass, performance, semi-intensive system