No abstract

-This study was conducted to evaluate the effect of cottonseed meal supplemented with lysine and enzyme on laying hens performance and egg quality. Eighty Hy-Line W-36 white Leghorns were allotted for 12 weeks in a 2 × 2 factorial experiment in a completely randomized design, including four treatments and five replications with four birds in each.Treatments included: basal diet + 1% lysine + 0% enzyme; basal diet + 1% lysine + 0.025% enzyme; basal diet + 2% lysine + 0% enzyme; and basal diet + 2% lysine + 0.025% enzyme. Protein content in the magnum tissue was not significantly affected by different levels of lysine and enzyme, although magnum Protein:RNA ratio increased with 2% of lysine as compared with 1%. Moreover, jejunum DNA's concentration was not significantly affected by lysine. Similarly, jejunum RNA:DNA ratio increased with 2% of lysine. Performance specificity significantly improved with 2% lysine and 0.025% enzyme. Diets supplemented with 2% lysine and 0.025% enzyme can improve performance, increase magnum protein synthesis and jejunum cell efficiency.

Este experimento se realizó para investigar el efecto de niveles crecientes de ALIMET ® (hidroxi análogo líquido de la metionina) en la dieta de broilers sobre los anticuerpos séricos, población microbiana y crecimiento. Se utilizó un diseño completamente al azar. Trescientos pollos Ross 308, no sexados fueron aleatoriamente asignados a 4 tratamientos con tres repeticiones de 25 pollos cada una. Los tratamientos incluían un control y tres niveles de suplementación de ALIMET ® (1,150, 1,437 y 1,725 g/kg en las dietas de iniciación y de 0,450; 0,562, y 0,675 g/kg en las dietas de crecimiento, respectivamente). Como resultado, la ganancia de peso aumentó linealmente con el incremento de la proporción de ALIMET ® en los periodos de 22 a 42 días (p