Selenito de sódio e selenometionina para galinhas poedeiras semipesadas

• Ano de defesa: 2019
• Autor(a) principal: Brito, Anna Neusa Eduarda Ferreira de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Zootecnia; Programa de Pós-Graduação em Zootecnia; UFPB
• Palavras-chave em Português: fonte inorgânica; fonte orgânica; qualidade ovo; desempenho; resistência de tíbia; CNPQ::CIENCIAS AGRARIAS
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/30709

The aim of this study was to evaluate the effects of sodium selenite replacement by selenomethionine on diets for laying hens. For this, 384 semi-weighted laying hens with 50 weeks of distribution were used from a completely randomized design in two treatments with twelve replicates of 16 birds per experimental unit. The experiment with chickens lasted 140 days, divided into five periods of 28 days. The treatments consisted in the supplementation of 0.3 ppm of selenium from an inorganic source (45% sodium selenite - SS) and an organic source (Selenomethionine - SeMet, 1%). Feed consumption, egg production, feed conversion per mass and per dozen eggs, egg weight and egg mass were evaluated. As bone parameters, the tibial resistance and the Seedor Index calculation were performed. In the last three days of each period egg quality assessments were performed for percentage of yolk, albumen and bark, specific gravity, bark resistance and Haugh Unit. The same quality evaluations were evaluated in the fifth (5th), tenth (10th), fifteenth (15th) and twentieth (20th) days of egg storage. The performance data were submitted to F test and Tukey's test and submitted to the factorial analysis scheme (source vs. time). The parameters of bark resistance and specific gravity were influenced by the substitution of selenomethionine, in which this treatment obtained averages of 3.68 kgf and 1.0767 g / cm3 for eggs submitted to storage at room temperature. There was influence on the bone parameters analyzed in which birds receiving selenomethionine in the diet obtained a mean of resistance of tibia and Seedor index of 28.56 kgf and 70.56, respectively, against 18.42 kgf and 60.04 of the birds that received sodium selenite in the diet. Therefore, selenomethionine did not influence the performance and egg quality variables of 1 day of laying, however, it obtained better indices for eggs stored for up to 20 days and provided better bone quality to the semidaid laying hens when compared to sodium selenite.