Relação treonina: lisina em rações para poedeiras leves no período de produção

• Autor(a) principal: Rocha, Tatiana Cristina da
• Data de Publicação: 2010
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1769
• topic: Galinha; Aminoácidos; Nutrição animal; Proteínas; Lisina; Treonina; Chicken; Amino acids; Animal nutrition; Proteins; Lysine; Threonine; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

Two experiments were conducted at the section of Aviculture of the Animal Science Department of the Universidade Federal de Viçosa, to determine the relationship for digestible threonine and lysine for light-weight laying hens, during a period of 24 to 40 and from 42 to 58 weeks of age. 216 Hy-Line W36 light-weight laying hens were used. The test was arranged in blocks completely randomized with six treatments, six blocks and six hens per experimental unit, in each experiment. The treatments consisted of a basal diet, with 14,2% of crude protein, deficient in digestible threonine (0,475%) with a threonine: lysine relationship of 65%, supplemented with 0,038; 0,076; 0,114; 0,152; 0,190 and 0,228% of L-threonine (98%), considering the digestibility of the threonine in 98,1%, in way to provide 0,475; 0,511; 0,548; 0,584; 0,621 and 0,657% of digestible threonine in the diets. The threonine:lysine relationships in each treatment was of 65; 70; 75; 80; 85 and 90%. The following parameters were evaluated: feed intake (g/hen/day), egg production (%), medium egg weight (g), egg mass yield (g/hen/day), egg components (% of peel, albumen and yolk indices) and final weight gain (g). The first experiment (24 to 40 weeks of age) had a negative lineal effect for the levels of digestible threonine on the medium weight of the eggs, for this variable the demand of digestible threonine is the smallest level used (0,475%). The demand of digestible threonine for posture, (feed conversion / dozen of eggs) and (feed conversion / eggs mass yield), using quadratic model, was of 0,570 (corresponding with a treonine: lysine relationship of 78%); 0,567 (threonine: lysine of 77,6%) and 0,547 (threonine: lysine of 75%), respectively. For the other variables there was no-significant effect observed. Concluding the variables studied the demand of digestible threonine for light-weight laying hens with 24 to 40 weeks of age is of 0,570%, corresponding the threonine: lysine relationship of 78%. In the second experiment (42 to 52 weeks) there was a non-effect for the levels of digestible threonine observed, on the studied variables. Therefore, the demand of digestible threonine for viii light-weight laying hens in the period from 42 to 58 weeks of age is of 0, 475%, corresponding with a threonine: lysine relationship of 65%.