The experiment was conducted in the Section of Aviculture, of the Department of Animal Science at the Federal University of Paraiba to study the acting of 324 laying hens Lohmann Brown, submitted to different proteins and energy levels among of the 43ª and 55ªweek of age. The laying hens were distributed in randomly experimental design in a factorial model 3x3, being 3 crude protein levels (15.50, 16.50 and 17.50%) and 3 energy levels (2700, 2800 and 2900 Kcal ME/kg), with 6 replicates and 6 laying hens for experiment unit. The parameters evaluated were production of eggs, mass of eggs, feed conversion for mass of eggs, weight of the egg, weight of albumen, weight of the yolk and weight of the shell, and their respective percentages. The crude protein and metabolizable energy levels had any significantlive influency (P>0.05) on the studied parameters. Crude protein and metabolizable energy levels shown linear effect (P<.05) only on weight and percentage of the albumen and shell, however there was not interaction on it. In conclusion the best crude protein and metabolizable energy levels for the laying hens Lohmann Brown in the period from 43 to 55 weeks were 17,50% of CP and 2900 Kcal of ME/kg for better weight and albumen percentage and of 15,50% of PB and 2700 Kcal of EM/kg for better weight and shell percentage.
Albumen; Energy; Laying Hens; Protein; Yolk
