Atualização da proteína ideal para poedeiras semipesadas: treonina e valina

• Ano de defesa: 2010
• Autor(a) principal: Lelis, Guilherme Rodrigues
• Orientador(a): Albino, Luiz Fernando Teixeira
• Banca de defesa: Cupertino, Edwiney Sebastião , Silva, Marcelo Dias da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Aminoácido; Produção de ovos; Poedeira
• Palavras-chave em Inglês: Amino acid; Eggs production; Hen
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/1757

Two experiments were conducted in the poultry sector of the Department of Animal Science, Federal University of Viçosa to update the profile of ideal protein for laying hens. In the first experiment, the object of this study was to evaluate the levels of digestible threonine to determine the ideal ratio of digestible threonine/lysine in rations for laying hens in the period 42-54 weeks of age. Were used 270 laying hens line Dekalb Brown during three experimental periods of 28 days each, in a completely randomized design with five treatments, nine replicates, each consisting of six birds. Five different ratios of threonine / digestible lysine were evaluated 66 (0.435% Thr dig), 70, 74, 78 and 82%. Diets were formulated to meet the nutritional requirements of animals and the relationship of amino acids, except threonine and lysine. Feed intake, egg weight, internal egg quality and weight gain were not influenced by the threonine / digestible lysine ratio used. Egg production, egg mass and feed conversion (kg / Dz and g / g) had quadratic effect for different ratios used. Based on the parameters, the threonine / digestible lysine ratio recommended in diets of laying hens during 42-54 weeks of age is 72%, which corresponds to 0.478% of digestible threonine or 460 mg / bird / day of digestible threonine. The second experiment, the object of the research was to evaluate the levels of digestible valine to determine the ideal ratio of valine/digestible lysine in rations for laying hens in the period 42-54 weeks of age. Were used 270 laying hens line Dekalb Brown during three experimental periods of 28 days each, in a completely randomized design with five treatments, nine replicates, each consisting of six birds. Five different ratios of valine / digestible lysine were evaluated 84 (0555% Val dig), 88, 92, 96 and 100%. The diets met the nutritional requirements of animals and the relationship of the amino acids except for valine and lysine. The egg weight, internal egg quality and weight gain were not influenced by the valine /digestible lysine ratio used. Feed intake was affected linearly, while egg production, egg mass and feed conversion (kg/Dz and g/g) had quadratic effect for the ratios used. The ideal valine /digestible lysine ratio, based on the parameters, is 92%, which corresponds to 0.607% of digestible valine or 567 mg / bird / day of digestible valine.