Diferentes níveis de valina em dietas para codornas de corte na fase de postura em duas gerações sucessivas

Abstract

This paper aims to evaluate the production performance and egg quality in two successive generations of females quails from a breeding program, feeding diets containing increasing levels of valine/lysine ratio 77%, 82%, 87%, 92% and 97%, from reproductive start age, 42 days to 126 days. The experimental design was randomly distributed with statistical analysis in mixed model using the PROC MIXED of SAS, in the first generation were 48 and second generation were 33 quails per treatment. The productive performance characteristics evaluated were: total egg production and percentage, daily feed intake, egg mass, feed conversion per dozen eggs and per egg mass and body weight. The quality of the eggs were individually evaluated: weight, width and length, egg specific gravity, albumen height and weights of yolk, albumen and shell, Haugh unit, shape index and shell thickness. For inclusion treatment valine/lysine the results were significant (P<0,05) for quail weight, daily feed intake, egg weight, albumen and shell, shell thickness, width and egg specific gravity, and mass conversion per dozen eggs. For interaction treatment*generation were significant (P<0,05) for egg weight, albumen and shell and shell thickness. Concluding that the performance traits weight of the quail (Pave), egg weight (Povo), feed conversion per egg mass (CAMO), feed conversion per dozen eggs (CA12) and daily feed intake (CRD), were influenced by relative levels of valine/lysine and their recommended inclusion levels are 89, 85, 83 and 82% respectively, while for the interaction treatment*generation there was not influence. For the characteristics of internal and external egg quality were influenced the level of valine / digestible lysine ratio width (Larg), albumen weight (Palb) and shell (Pcasca), specific gravity (GE) of the egg, shell thickness (Espe) and egg weight (Povo), for these were also considered the influence of the interaction treatment * generation to Pcasca, Palb, Povo and Espe is recommended depending on the best adjustments (R2) the ratio of valine / digestible lysine of 87%.