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O experimento foi realizado para determinação da exigência de metionina + cistina (met + cis) da ração para pintos de corte do 1º ao 21º dia de idade mantidos em ambiente termoneutro. Foram utilizados 400 pintos de corte machos Avian Farms, distribuídos em delineamento inteiramente casualizado, com cinco tratamentos (0,756; 0,810; 0,866; 0,920 e 0,976% de met + cis), oito repetições e dez aves por unidade experimental. O aumento do nível de met + cis influenciou o ganho de peso (GP), a conversão alimentar, o consumo de met + cis, a deposição de proteína, o peso absoluto do fígado, da moela, dos pulmões e o peso relativo dos pulmões. Não foi verificado efeito dos níveis de met + cis sobre o consumo de ração, a deposição de gordura, o peso absoluto da carcaça, do coração, do proventrículo e do intestino, nem sobre o peso relativo do coração, do fígado, da moela, do proventrículo e do intestino. O nível de 0,866% de met + cis total (0,790% de met + cis digestível calculado), correspondente à relação met + cis/lis total de 69% (72% para digestível), proporcionou o melhor GP, enquanto o nível de 0,898% de met + cis total (0,822% digestível calculado), correspondente à relação met + cis/lis total de 72% (74% para digestível), proporcionou melhor valor de conversão alimentar de pintos de corte mantidos em ambiente termoneutro. The experiment was conducted to determine the effect of dietary methionine + cystine (met + cys) requirement of 1-to-21-day-old broiler chicks on thermoneutral environment. Four hundred Avian Farm male broiler chicks were assigned to a randomized experimental design with five treatments (0.756, 0.810, 0.866, 0.920, and 0.976% of met + cys), eight replicates of ten birds. Weight gain (WG), feed:gain ratio, met + cys intake, protein deposition of absolute weights of liver, gizzard, and lung and relative weights of lung were affected by the increasing dietary met + cys levels. No effect of met + cys levels on feed intake, fat deposition, absolute weights of carcass, proventriculus, heart, and intestine or relative weights of heart, liver, gizzard, proventriculus, lung and intestines was verified. The best WG was observed at 0.866% met + total cys (0.790% met + digestible cys calculated) level, corresponding to 69% met + cys/total lys ratio (72% for digestible) and the best feed:gain ratio value was observed at 0.894% met + total cys (0.822% digestible calculated) level, corresponding to 72% met + cys/ digestible lys total ratio (74% met + cys/digestible lys ratio), for broiler chicks on thermoneutral environment

Níveis de metionina + cistina para pintos de corte mantidos em ambiente termoneutro