Níveis nutricionais de lisina, de metionina+cistina e de treonina digestíveis para galinhas poedeiras no 2º ciclo de produção

• Ano de defesa: 2006
• Autor(a) principal: Schmidt, Marlene
• Orientador(a): Gomes, Paulo Cezar
• Banca de defesa: Albino, Luiz Fernando Teixeira , Rostagno, Horácio Santiago , Nunes, Ricardo Vianna , Pupa, Júlio Maria Ribeiro
• 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: Aminoácidos; Proteína ideal; Poedeiras; Lisina; Metionina; Cistina; Treonina
• Palavras-chave em Inglês: Amino acids; Proteins; Hens; Lysine; Methionine Cystine; Threonine
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/1688

Three experiments were carried out on the Sector of Aviculture of the Zootechny Department of the Universidade Federal de Viçosa UFV, aiming at determining the nutritional requirement of digestible lysine, methionine+cystine and threonine to laying hens on the 2nd cycle of production, from 79 to 95 weeks of age. 180 Lohmann LSL and 180 Lohmann Brown laying hens, white-egg and brown-egg, respectively, were used in each experiment. On the experiment of lysine a basal diet deficient in this amino acid (0.555%) was used, supplemented with 0.00; 0.066; 0.132; 0.198 and 0.263% of L-Lis HCl (78%), providing 0.555; 0.605; 0.655, 0.705 and 0.755% of digestible lysine in the diet. On the experiment of methionine+cystine the birds were submitted to basal diet deficient in this amino acid (0.490%), supplemented with 0.00; 0.053; 0.108; 0.161 and 0.214% of DL-Methionine (98%), providing 0.490; 0.542; 0.594; 0.648 and 0.698% of digestible methionine+cystine in the diets. The levels of supplementation of digestible methionine+cystine followed the relations of methionine+cystine: lysine of 75, 83, 91, 99 and 107 with lysine fixed at 0.653%. On the experiment of threonine the levels were obtained through a basal diet deficient in threonine (0.380%), supplemented with 0.00; 0.036; 0.065; 0.108 and 0.144% of L-Threonine (98%), providing 0.380; 0.413; 0.446; 0.479 and 0.512% of digestible threonine in the diets. The five levels of supplementation of digestible threonine followed the relations of threonine: lysine of 58; 63; 68; 73 and 78 with lysine fixed at 0.653%. A complete randomized blocks design in a factorial arrangement 5 x 2, with five levels of amino acid and two strains of birds, with six replicates/treatment and six birds/replicate was used in the three experiments. The analyzed parameters were feed intake, lysine intake, egg dozen conversions, egg mass conversions, weight gain, egg production, egg weight, egg mass, percentage of the components of the eggs (shell, albumen and yolk) and the internal egg quality (Haugh unit, yolk and albumen indexes). The estimate requirement of digestible lysine for the white-egg laying hens, through linear effect was higher or equal to 0.755%, what corresponds to an intake of at least 885 mg of digestible lysine/bird/day. For the brown-egg strains the established amount of requirement of digestible lysine through quadratic effect was 0.681% of lysine, what means an intake of 783 mg of digestible lysine/bird/day. The estimate requirement of digestible methionine+cystine through linear effect was higher or equal to 0.698%, not only for the white-egg strain but also for the brown-egg one. The value of 0.698% corresponds to an intake of at least 796 and 791 mg of digestible methionine+cystine/bird/day, for the white-egg and brown-egg strain, respectively. The estimate requirement of digestible threonine through quadratic effect was 0.469%, corresponding to an intake of 459 mg of threonine/bird/day and 0.467% of digestible threonine, corresponding to an intake of 462 mg of threonine/bird/day, for the white-egg and brown-egg strain, respectively.