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O experimento foi realizado com a finalidade de determinar as exigências nutricionais de metionina+cistina (M+C) de poedeiras semipesadas. Foram utilizadas 360 aves distribuídas em delineamento inteiramente casualizado, com cinco tratamentos e 12 repetições de seis aves. As rações experimentais com 17,2% PB (isoprotéicas) e 2.800 kcal EM/kg (isocalóricas) foram formuladas à base de milho e farelo de soja para atender às exigências de todos os nutrientes, exceto M+C, sendo suplementadas com DL-metionina (99%) em substituição ao amido de milho para proporcionar cinco níveis (0,61; 0,68; 0,75; 0,82 e 0,89%) de M+C total. As características de desempenho foram avaliadas no período de 20 a 44 semanas de idade das aves. Os níveis de M+C afetaram o desempenho das aves, com efeito quadrático sobre o peso dos ovos, a massa de ovos e a conversão por massa de ovos. As estimativas encontradas foram de 0,73; 0,69 e 0,69% de M+C total ou 0,66; 0,63 e 0,63% de M+C digestível respectivamente. Portanto, recomenda-se 0,70 e 0,64%, ou consumo de 762 e 697 mg, respectivamente, de M+C total e digestível/ave/dia para poedeiras semipesadas do início de produção até o pico de postura. A trial was carried out to determine the nutritional requeriments of methionine + cystine (M+C). A total of 360 laying hens was allotted to a completely randomized design with five treatments and 12 replicates of six birds. The corn-soybean meal based diets were formulated to be isonitrogenous (17.2% CP) and isoenergy (2,800 kcal ME/kg) to meet the bird requeriment in all nutrients, except for M+C, that was supplemented with DL-methionine (99%) in replacement with corn starch. The following total M+C levels were obtained: 0.61, 0.68, 0.75, 0.82, and 0.89%. All variables were evaluated from 20 to 44 weeks old. Egg weight, egg mass and egg mass:feed ratio were all affected quadratically by the M+C levels. The estimates obtained were: 0.73, 0.69, and 0.69% of total lysine and 0.66, 0.63, and 0.63% of digestible M+C, respectively. Therefore, it is recommended levels of 0.70 and 0.64% or intake of 762 and 697 mg total and digestible M+C/bird/day, respectively, for semi-heavy laying hens from the starter to peak of egg production

Exigências nutricionais de metionina+cistina para poedeiras semipesadas do início de produção até o pico de postura