Benjamín Fuente Martínez, Antonio Díaz Cruz, Jorge Lecumberri López, Ernesto Avila González
Se realizaron dos experimentos con el objeto de conocer las necesidades de lisina y aminoácidos azufrados digestibles en gallinas Leghorn Blancas; para cada uno de ellos se emplearon 240 gallinas de la línea Isa Babcock B-300 de 24 semanas de edad, alojadas en jaula. Se utilizaron diseños completamente al azar, con cinco tratamientos en ambos experimentos. En el experimento 1 se emplearon cinco niveles de lisina digestible (0.47%, 0.57%, 0.67%, 077% y 0.87%) y en el experimento 2, cinco niveles de metionina + cistina digestibles (0.41%, 0.47%, 0.53%, 0.59% y 0.65%). En los experimentos, las dietas basales se elaboraron con sorgo, soya y gluten de maíz, con 15.69% de proteína, y para lograr los diferentes niveles de aminoácidos en las dietas se empleó L-lisina HCl y DL-metionina. Se llevaron registros de las variables productivas, porcentaje de postura, peso del huevo, masa del huevo ave-día, consumo de alimento y conversión alimentaria. Los datos de las variables para cada estudio se analizaron por medio de un análisis de varianza multivariado. Los resultados en diez semanas para los experimentos mostraron un efecto cuadrático (P < 0.01), los niveles óptimos para un máximo comportamiento productivo fueron de 0.728% de lisina digestible y 0.615% de metionina + cistina digestible; o un consumo diario por ave de 655 mg de lisina y 553 mg de aminoácidos azufrados digestibles. Estos resultados indican que las relaciones ideales, para la gallina de postura, lisina y metionina + cistina digestibles para un máximo comportamiento son: considerando a la lisina como 100% de 84.4% para metionina + cistina
In order to know the requirements of digestible lysine and sulfur amino acids in White Leghorn hens, two experiments were conducted. Two hundred and forty caged laying hens, Isa Babcock B-300 line, were used in each experiment. The birds were 24 weeks old. Completely randomized designs with 5 treatments were used in both experiments. In Experiment 1, the treatments were 5 amounts of digestible lysine (0.47%, 0.57%, 0.67%, 0.77% and 0.87%), and in Experiment 2 the treatments were 5 amounts of digestible methionine + cystine (0.41%, 0.47%, 0.53%, 0.59% and 0.65%). The basal diets with 15.69% crude protein were based on sorghum + soybean and corn yellow gluten meal. In order to reach the required amino acid levels in the experimental diets, HCl L-lysine and DL- methionine were added. In each experiment, the studied productive parameters that were analyzed by multivariate variance analysis were: laying percentage, egg weight, egg mass per bird per day, feed consumption and feed conversion. The results obtained through 10 weeks of experimentation showed a quadratic effect (P < 0.01), the optimum levels in order to reach maximum productivity were 0.728% of digestible lysine and 0.615% of digestible methionine + cystine with a daily feed consumption per bird of 655 mg of lysine and 553 mg of sulfur amino acids. These results suggest that the ideal relationship for maximum productivity in layer hens is: lysine at 100% and methionine + cystine at 84.4%.
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