Teores de energia e fibra bruta para poedeiras nas fases de recria e produção

Abstract

Two experiments were carried out to evaluate the energy reduction and the inclusion of different fibers in the layers diets. The experiment I was carried out in the growth phase (12 to 17 weeks age), with 1344 Hy-Line® in completely randomized design, consisting in two nutritional plans ( 2910 e 2775 kcal/kg) and eight replications of 84 birds, using wheat bran. The experiment II was carried out in the same birds house in completely randomized design, in a factorial arrangement, with two nutritional plans in the rearing phase and four treatments in the production phase, using a control diet (2784 kcal of ME/kg) with corn and soybean meal, and four others diet varying the fiber source, wheat bran, soybean rolls and Tifton hay (2690 kcal of ME/kg). Birds fed the diet with lower energy in the rearing phase showed higher feed intake, less weight gain, worst feed conversion and heavier gizzard than the birds fed diets with higher energy content. There was no interaction between the diets of growing and production rations for the variables evaluated, except for Haugh units of eggs of birds at 20 weeks of age. Residual effect of rearing diets (P >0,05) in the production phase, the birds fed diet growth with lower energy content continued to have higher feed intake during the production phase. There was no effect of feed production (P> 0.05) in weight and egg production on egg mass and number of eggs per bird housed. It was concluded that diets with higher energy content and lower inclusion of wheat bran was more efficient for the growth phase and the wheat bran, soybean hulls and Tifton hay are viable alternatives for feeding laying hens.