Egg shell quality of laying hens fed on different levels of deffated rice bran and of phytase

• Alba Kyonara Barbosa ^[1] ; Alves Tenório Fireman ^[1] ; Jorge Lopez ^[1] ; Francisco Antonio Tenório Fireman ^[1]
  1. [1] Universidade Federal do Rio Grande do Sul

     Universidade Federal do Rio Grande do Sul

     Brasil

     
• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 7, Nº. 2, 1999
• Idioma: inglés
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• Resumen

  • 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.