Níveis de lisina digestível em rações para alevinos de tilápia do Nilo

• Ano de defesa: 2008
• Autor(a) principal: Takishita, Sylvia Sanae
• Orientador(a): Lanna, Eduardo Arruda Teixeira
• Banca de defesa: Abreu, Márvio Lobão Teixeira de , Brustolini, Paulo César
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Aminoácido; Lisina digestível; Oreochromis niloticus
• Palavras-chave em Inglês: Amino acid; Digestible lysine; Oreochromis niloticus
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5568

The current study was aimed at evaluating the effect of digestible lysine levels in diet for Nile tilapia fingerlings (Oreochromis niloticus), of the thailand lineage based on the ideal protein concept in a 32 days trial. 432 Nile tilapia fingerlings with an average initial weight of 0.98 ± 0.03 g were allotted in a completely randomized design, with six treatments, six replications per treatment and twelve fish per experimental unit. The treatments had consisted of six isoenergetic (3.000 Kcal of DE/Kg of food) and isoproteic (39.14% of CP) diets with different levels of digestible lysine (1.50%, 1.66%, 1.82%, 1.98%, 2.14% and 2.30%). Feed intake, digestible lysine intake, weight gain, specific growth rate, survival rate, feed conversion, daily protein deposition rate, daily fat deposition rate, chemistry body composition (humidity, protein and fat content) and nitrogen retention efficiency were evaluated. The survival rate, body fat and humidity content, and body fat deposition on the fish was not affected by the level of digestible lysine of the diets. The increasing levels of lysine improved linearly the parameters of digestible lysine intake, feed conversion, body protein content and body protein deposition. However, the LRP (Linear Response Plateau) was the model which best fit the parameters of feed consumption, weight gain, specific growth rate and nitrogen retention efficiency, estimating at 2.06%, 2.17%, 2.14% and 2.12% the level of digestible lysine to maximize each of the parameters cited, respectively. It was concluded that the total and digestible lysine requirement for Nile tilapia fingerlings was 2,32% (0,773% / Mcal of DE) and 2,17% (0,723% / Mcal of DE), respectively, that correspond to a daily intake of 7,21 mg of total lysine and 6,67 mg of digestible lysine to meet the main parameters of performance (feed consumption, weight gain and specific growth rate) and carcass characteristics (nitrogen retention efficiency), when the ideal protein concept in the formulation of experimental diets was used.