Modeling and optimization of essential amino acids effects on productive performance in second-cycle hens

摘要

In this study,a model based on a modification of the Gompertz equation was used to estimate the maximum percentage of egg production and digestible requirements of lysine(Lys),methionine + cystine(Met+Cys)and threonine(Thr)of H&N brown laying hens during 16 weeks of production.The productive performance model was adjusted to field data of 23 treatments,which were defined from a composite central design that combines five levels of Lys,Met+Cys,and Thr ranged from 0.636% up to 1.000%;0.579% up to 0.910%;0.483% up to 0.760%,respectively.The proposed model showed to be adequate to evaluate the efficiency in the use of digestible amino acids for egg production and can be a useful tool to diagnose the effectiveness of the nutritional requirements in each of the production phases.