Lisina e metionina+cistina digestíveis sobre o desempenho, rendimento, qualidade e morfometria do músculo peitoral (Pectoralis major) de frangos de corte

• Ano de defesa: 2015
• Autor(a) principal: Domingues, Carla Heloisa de Faria [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Frango de corte; Aminoacidos na nutrição animal; Carne de ave; Desempenho; Fibras; Poultry as food
• Link de acesso: http://hdl.handle.net/11449/123847; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/09-06-2015/000833283.pdf

Two experiments were conducted to evaluate different levels of digestible lysine and methionine+cystine on growth performance, carcass yield, morfphometry of breast fillet and muscle fibers and meat quality of pectoral muscle (Pectoralis major) of broilers at 1 to 21 (first experiment) and 22 to 42 (second experiment) days of age. A total of 4,800 one-day-old male Cobb® 500 chicks were used, distributed in a completely randomized design with ten treatments (factorial arrangement 2x5) and eight replicates of 30 birds each. Treatments had two digestible lysine levels (experiment 1: 1.253 and 1.378%; experiment 2: 1.100 and 1.210%) x five digestible methionine+cystine levels (experiment 1: 0.812, 0.857, 0.902, 0.947 and 0.992%; experiment 2: 0.724; 0.764; 0.804; 0.844; 0.884%). For the experiment conducted during initial phase, it is concluded that the use of different levels of digestible lysine and methionine+cystine in diet had influenced on meat quality and morphology of Pectoralis major muscle fibers. Regarding the performance and carcass yield, lower levels of digestible lysine (1.253%) and methionine+cystine (0.812%) achieved bird's requirements at 1 to 21 days old. For the experiment conducted during the growth phase, it is concluded that different digestible lysine and methionine+cystine levels had influenced the morphology of Pectoralis major muscle fibers. Regarding the performance, meat quality and carcass yield, lower digestible lysine (1.100%) and methionine+cystine (0.724%) levels achieved bird's requirements. However, for better thighs and drumsticks ...