Relações valina:lisina em rações para poedeiras leves de 24 a 58 semanas de idade

• Ano de defesa: 2013
• Autor(a) principal: Almeida, Rodrigo Lopes de
• Orientador(a): Gomes, Paulo Cezar
• Banca de defesa: Barreto, Sérgio Luiz de Toledo , Donzele, Juarez Lopes , Brumano, Gladstone , 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: Galinhas poedeiras; Aminoácidos digestíveis; Desempenho
• Palavras-chave em Inglês: Laying hens; Ileal digestible amino acids; Performance
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1857

Two experiments were carried to determine the ideal ratio of digestible valine:digestible lysine in diets for light laying hens from 24 to 40 and 42 to 58 weeks of age. A total of 288 laying hens Hy-Line W-36 were used in each experiment. The hens were distributed in a completely randomized experimental design with 6 treatments, 8 replicates and 6 hens per experimental unit. When they completed 24 (experiment I) and 42 (experiment II) weeks of age the birds received the experimental treatments that consisted of diets isonutrient, except for levels of digestible valine. The levels of digestible valine used in diets were 0,615; 0,653; 0,691; 0,729; 0,767 and 0,805% and 0,639; 0,678; 0,717; 0,757; 0,796 and 0,835%, for the experements I and II, providing ratios of digestible valine:digestible lysine of 81; 86; 91; 96; 101 and 106%. Was used a suboptimal level of digestible lysine in the diets of 0.759 and 0.788%. In both experiments the following parameters were evaluated: food intake (feed, digestible tryptophan and digestible lysine), egg production, avarege egg weight, egg mass, feed conversion (dozen eggs and egg mass), efficiency of digestible lysine utilization, egg components, weight gain, eggs unmarketable and nitrogen balance. In the experiment I there was a linear effect on weight gain. Was observed a quadratic effect on feed intake, digestible valine intake, digestible lysine intake, egg production, egg mass, feed conversion per egg mass. For egg mass and feed conversion per egg mass there was best fitted of the data to the LRP model. For the LRP model was obtained smallest sum of squared deviations. The ideal valine:digestible lysine ratio is 93,06%. In the experiment II was observed linear effect on digestible valine intake. There was quadratic effect on egg production and egg mass. For weight gain there was best fitted of the data to the LRP model. The ideal valine:digestible lysine ratio is 92,47%. The ideal ratio of digestible valine:digestible lysine recomme14nded in diets for light laying hens from 24 to 40 and 42 to 58 week of age are 93,06% and 92,47%, respectively.