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Necesidades de mantenimiento de cisteína, aminoácidos sulfurados, tirosina, fenilalanina + tirosina y aminoácidos no esenciales en reproductoras pesadas Se calcularon las necesidades, en balance de nitrogeno 0, resultando en valores de 65,907 mg/d, 37,233 mg/ kgPV0,75/d o 175,566 mg/kgCP/d para la tirosina, de 352,18 mg/b/d, 190,37 mg/kgPV0.75/d o 749,33 mg/kgCP/d para fenilalanina:tirosina y de 3715,194 mg/d, 2003,155 mg/kgPV0.75/d o 9452,954 mg/kgCP/d para los AA no esenciales RD Ekmay, SJ Mei, NK Sakomura y CN Coon, 2016. Poultry Science 95:1341–1347 http://dx.doi.org/10.3382/ps/pew031 Se realizó un experimento de 21 días de duración con 250 reproductoras pesadas Cobb-Vantress para determinar las necesidades de mantenimiento de cisteína, tirosina y aminoácidos (AA) no esenciales así como la eficiencia de su utilización dietética. Las reproductoras se alimentaron con un pienso que contenía los aminoácidos en forma cristalina y niveles crecientes de cisteína o tirosina que cubrían un 0, 10, 20, 30 y 40% de la estimación de sus necesidades y manteniendo el resto de AA al 40% del nivel estimado de sus necesidades. Para determinar el nivel de mantenimiento de los AA no esenciales, se utilizaron niveles crecientes de los mismos, aportados por el ácido glutámico para alcanzar 12, 19, 26, 33, y 40% del nivel ideal de ácido glutámico, manteniendo el resto de AA al nivel de sus necesidades de mantenimiento. Las necesidades de AA sulfurados (TSAA) y de fenilalanina + tirosina se calcularon combinando los resultados de cisteína y tirosina, respectivamente con la metionina y la fenilalanina, respectivamente. La pendiente de la regresión lineal de la retención de cisteína, tirosina y AA no esenciales indicó que se retuvo el 29% de la cisteína, el 24% de TSAA, el 21% de fenilalanina + tirosina y el 9% de los AA no esenciales. Se realizaron los cálculos de las necesidades en balance de nitrógeno cero, resultando en valores de 30,48 mg/d, 17,006 mg/ kgPV0.75/d o 75,426 mg/kgCP/d de cisteína, de 132,25 mg/b/d, 71,48 mg/kgPV0.75/d, y 307,55 mg/kgCP/d para AA no esenciales y de 65,907 mg/d, 37,233 mg/ kgPV0,75/d o 175,566 mg/kgCP/d para la tirosina, de 352,18 mg/b/d, 190,37 mg/kgPV0.75/d o 749,33 mg/kgCP/d para la fenilalanina:tirosina y de 3715,194 mg/d, 2003,155 mg/kgPV0.75/d o 9452,954 mg/kgCP/d para los AA no esenciales. The cysteine, total sulfur amino acid, tyrosine, phenylalanine + tyrosine, and non-essential amino acid maintenance requirements of broiler breeders The Tyr requirement for zero protein accretion was calculated to be 65.907 mg/d or 37.233 mg/ kgBW0.75/d or 175.566 mg/kgCP/d. The Phe + Tyr requirement for zero protein accretion was calculated to be 352.18 mg/b/d, 190.37 mg/kgBW0.75/d, and 749.33 mg/kgCP/d. The non-essential AA requirement for zero protein accretion was calculated to be 3715.194 mg/d or 2003.155 mg/kgBW0.75/d or 9452.954 mg/kgCP/d. RD Ekmay, SJ Mei, NK Sakomura, and CN Coon, 2016. Poultry Science 95:1341–1347 http://dx.doi.org/10.3382/ps/pew031 Two hundred and fifty Cobb-Vantress broiler breeders were used to determine the maintenance requirement and efficiency of utilization of dietary Cys, Tyr, and non-essential amino acids (AA) in a 21-day experiment. The breeders were fed crystalline amino acid diets containing graded levels of Cys or Tyr representing 0, 10, 20, 30, and 40% of their suggested requirement level with all other amino acids maintained at 40% of their suggested requirement level. To determine the non-essential AA maintenance requirement, graded levels of non-essential AA were provided by glutamic acid to represent 12, 19, 26, 33, and 40% of the ideal level of glutamic acid with all other amino acids maintained at their maintenance requirement level. The total sulfur amino acid (TSAA) and Phe + Tyr requirements were calculated by combining Cys and Tyr results, respectively, with previously determined Met and Phe, respectively. The slope of Cys, Tyr, and non-essential AA accretion regression line indicated that 29% Cys, 24% TSAA, 21% Tyr, 20% Phe + Tyr, and 9% nonessential AA of crystalline amino acids were retained. The Cys requirement for zero protein accretion was calculated to be 30.48 mg/d or 17.006 mg/ kgBW0.75/d or 75.426 mg/kgCP/d. The TSAA requirement for zero accretion was calculated to be 132.25 mg/b/d, 71.48 mg/kgBW0.75/d, and 307.55 mg/kgCP/d. The Tyr requirement for zero protein accretion was calculated to be 65.907 mg/d or 37.233 mg/ kgBW0.75/d or 175.566 mg/kgCP/d. The Phe + Tyr requirement for zero protein accretion was calculated to be 352.18 mg/b/d, 190.37 mg/kgBW0.75/d, and 749.33 mg/kgCP/d. The non-essential AA requirement for zero protein accretion was calculated to be 3715.194 mg/d or 2003.155 mg/kgBW0.75/d or 9452.954 mg/kgCP/d.