Resumen de Egg shell quality of laying hens fed on different levels of deffated rice bran and of phytase
Alba Kyonara Barbosa, Alves Tenório Fireman, Jorge López, Francisco Antonio Tenório Fireman
A total of 864 laying hens H&N Nick chick, of 90% initial egg production, were used in nine treatments with eight replications, in a completely randomized design, with a factorial arrangement 3 × 3 of treatments: 0, 20 or 40 % of deffated rice bran (DRB) and 0, 300 or 600 phytase units (PTU)/kg. Data were analysed by analysis of variance, followed by polynomial regression. As DRB increased there was a decrease of egg specific gravity, and egg shell calcium deposition and weight. Addition of phytase corrected the adverse effects on egg shell quality as dietary DRB increased.
