Lisina digest?vel para frangos de corte tipo caipira

• Main Author: Oliveira, Renata Gomes
• Other Authors: Pinheiro, Sandra Regina Freitas
• Language: Portuguese
• Published: UFVJM 2015
• Subjects: Amino?cido; Prote?na ideal; Qualidade da carne; Rendimento de carca?a; Sistema semi-intensivo
• Online Access: http://acervo.ufvjm.edu.br:8080/jspui/handle/1/331

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No. of bitstreams: 2 renata_gomes_oliveira.pdf: 686590 bytes, checksum: 0f17761923025eae7337021352f6c0bd (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2013 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) === Foram conduzidos quatro experimentos para avaliar n?veis de lisina digest?vel para frangos de corte tipo caipira, linhagem Colonial, machos e f?meas, criados em semiconfinamento durante as fases: inicial (1 a 21 dias), crescimento I (22 a 42 dias), crescimento II (43 a 56 dias) e final (57 a 60 dias). As aves foram alojadas em 30 boxes (?rea de abrigo), com acesso ? ?rea de pastejo. Em cada experimento foram utilizados 630 frangos e o delineamento experimental utilizado foi inteiramente casualisado, em esquema fatorial 5x2 (n?veis de lisina x sexo) e tr?s repeti??es de 21 aves cada. Os n?veis de lisina digest?vel avaliados foram: 8,1; 9,5; 10,9; 12,3 e 13,7(g/kg) na fase inicial; 7,07; 8,07; 9,07; 10,7 e 11,07 (g/kg) na fase de crescimento I; 6,07; 7,07; 8,07; 9,07 e 10,07 (g/kg) na fase de crescimento II e 6,0; 7,0; 8,0; 9,0 e 10,0 (g/kg) na fase final. As vari?veis de desempenho avaliadas foram: consumo de ra??o (CR, g/ave), consumo de lisina (CL, g/ave), ganho em peso (GP, g/ave) e convers?o alimentar (CA, g ra??o consumida/ g de ganho em peso). Foram avaliadas as vari?veis de carca?a e de qualidade da carne: rendimento de carca?a, peso da gordura, rendimento e peso dos cortes de peito, de asa+coxinha e de coxa+sobrecoxa, o potencial hidrogeni?nico (pH), a capacidade de reten??o de ?gua (CRA), a perda de peso por cozimento (PPC), a maciez objetiva (MO) cor e luminosidade (L*, a*, b*). Para o per?odo inicial, recomenda-se o n?vel de 12,95 g de lisina/kg, na ra??o de machos e f?meas para melhor CA. Na fase de crescimento I, recomenda-se 9,61 g de lisina/kg na ra??o para minimizar a CA de ambos os sexos, e, para melhor GP, os n?veis de 10,08 e 9,49 g de lisina digest?vel/kg na ra??o de machos e f?meas, respectivamente. Verificou-se que, para a fase de crescimento II, o n?vel de 6,0 g lisina/kg de ra??o atende ?s exig?ncias dos frangos. Para a fase final, observou-se efeito dos n?veis de lisina digest?vel para a CA, sendo recomendados 8,51 g de lisina/kg de ra??o. Para as vari?veis de rendimento de carca?a obteve-se efeito linear crescente de lisina sobre o rendimento de coxa + sobrecoxa das f?meas. A MO da carne de coxa aumentou, linearmente, com os n?veis de lisina, e, para a CRA e L* da carne do peito, observou-se efeito linear decrescente dos n?veis de lisina. === Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013 === ABSTRACT Four experiments were carried out to determine the digestible lysine requirements for alternative line of broilers, Colonial line, male and female, created in free range system during phases: initial phase (1 to 21 days), growing I (22-42 days), growing II (43-56 days) and last phase (57-60 days). The birds were distributed into 30 pens (shelter area) with access to the pasture. In each trial, 630 birds were used and the experimental design was a completely randomized in a factorial arrangement 5 x 2 (levels of lysine and gender), with three replicates of 21 birds each. The digestible lysine levels evaluated were: 8.1; 9.5; 10.9, 12.3 and 13.7 (g/kg) for initial phase, 7.07, 8.07, 9.07, 10.07 and 11.07 (g/kg) for growing phase I, 6.07, 7.07, 8.07, 9.07 and 10.07 (g/kg) for growing phase II and 6.00, 7.00, 8.00, 9.00 and 10.0 (g/kg) for the last phase. The performance parameters evaluated were: feed intake (FI, g/bird), lysine intake (LI, g/bird), weight gain (WG, g/bird) and feed convertion (FC, g feed intake/ g weight gain). There was evaluated carcass parameters and meat quality: carcass yield, fat weight, yield and weight about the cuts (breast, wing + drumstick, thigh + drumstick), hydrogen potential (pH), water holding capacity (WHC), cooking loss (CL), tenderness, color and brightness (L*, a*, b*). For the initial phase we recommend the level of 12.95 g of lysine/ kg, on the ration for males and females to improve FC. In the growing phase I, we recommend 9.61 g of lysine/kg in the ration to minimize FC for both genders, and to improve WG the levels 10.08 and 9.48 g of digestible lysine/kg on the ration for males and females, respectively. We verified that for growing phase II, the level of 6.0 g of lysine/kg on the ration meets the chicken?s requirements. At last phase, there was digestible lysine effect for FC and can be recommended 8.51 g of lysine/ kg. For yield carcass parameters, there was an increasing linear effect of females? thigh + drumstick. The tenderness increased linearly with lysine levels and for WHC and L* of the meat breast there was a decreasing linear effect of lysine levels.