Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-12T18:46:07Z No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mariana_resende_castro.pdf: 795870 bytes, checksum: e00feebf3320e268af70b9a9f164f00a (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-12T18:46:24Z (GMT) No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mariana_resende_castro.pdf: 795870 bytes, checksum: e00feebf3320e268af70b9a9f164f00a (MD5) / Made available in DSpace on 2016-01-12T18:46:24Z (GMT). No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mariana_resende_castro.pdf: 795870 bytes, checksum: e00feebf3320e268af70b9a9f164f00a (MD5) Previous issue date: 2014 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG) / Foram desenvolvidos sete experimentos para determinar as rela??es metionina + cistina (M+C): lisina (Lis) digest?veis em ra??es de codornas de corte (Coturnix coturnix). Para os per?odos de crescimento (um a sete, oito a 14 e 15 a 21 dias de idade) as codornas foram criadas em lotes mistos, e receberam ra??o basal, contendo 0,76 g metionina + cistina digest?vel, suplementada com cinco n?veis de DL-Metionina, o que correspondeu ?s rela??es M+C: Lis digest?veis de 0,61; 0,66; 0,71; 0,76 e 0,81. Para os per?odos de termina??o (22 a 28 e 29 a 35 dias de idade), aves foram criadas em lotes sexados, e receberam ra??o basal, contendo 0,63 g metionina + cistina digest?vel, suplementada com cinco n?veis de DL-Metionina, o que correspondeu ?s rela??es M+C: Lis digest?veis de 0,68; 0,73; 0,78; 0,83 e 0,88. O delineamento experimental utilizado foi o inteiramente casualizado, com cinco tratamentos e oito repeti??es. Nos per?odos de um a sete e oito a 14 dias de idade observou-se efeito das rela??es M+C: Lis digest?veis para todas as vari?veis de desempenho, exceto para viabilidade das aves. Durante o per?odo de 15 a 21 dias, as crescentes rela??es M+C: Lis digest?veis influenciaram todas as vari?veis, exceto a uniformidade e viabilidade das codornas. N?o houve efeito das rela??es M+C: Lis digest?veis no per?odo de 22 a 28 dias, para as codornas machos, entretanto, para as f?meas observou-se efeito para consumo de ra??o e ganho em peso. No per?odo de 29 a 35 dias para os machos, observou-se efeito para o consumo de ra??o, consumo de metionina + cistina, ganho em peso, extrato et?reo da carca?a, rendimento de coxa+sobrecoxa, prote?na bruta da carca?a e balan?o de nitrog?nio. No entanto, para as codornas f?meas de 29 a 35 dias de idade, n?o observou-se efeito para nenhuma das vari?veis estudadas frente ?s rela??es M+C: Lis digest?veis. As rela??es M+C: Lis digest?veis que otimizaram o ganho em peso foram de 0,81; 0,75 e 0,77 para os per?odos de um a sete, oito a 14 e 15 a 21 dias de idade, respectivamente, para codornas de ambos os sexos. Durante os per?odos de 22 a 28 e 29 a 35 dias de idade das codornas f?meas recomendam-se as rela??es de 0,79 e 0,68, respectivamente, e para as codornas machos, recomendam-se as rela??es de 0,68 e 0,88 M+C: Lis digest?veis. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT Seven experiments were conducted to determine the relations methionine and cystine (M+C): digestible lysine (Lys) in feed quails (Coturnix coturnix). For the growth periods (one to seven, eight to 14 and 15 to 21 days old) quails were created in mixed batches, and fed a basal diet containing 0.76 g methionine + cystine, supplemented with five levels of DL-Methionine, corresponding to the relations M+C: digestible Lys 0.61, 0.66, 0.71, 0.76 and 0.81. For final periods (22 to 28 and 29 to 35 days old), quails were created in sexed lots, and received basal diet containing 0.63 g methionine + cystine, supplemented with five levels of DL-Methionine, the corresponding to the relations M+C: digestible Lys 0.68, 0.73, 0.78, 0.83 and 0.88. The experimental design was completely randomized with five treatments and eight replicates. In periods of one to seven and eight to 14 days of old was observed effect of the relations M+C: digestible Lys for all performance traits, except for viability of quails. During the period of 15 to 21 days, the growth relations M+C: digestible Lys influenced all traits, except the uniformity and viability of quail. There was no effect of the relations M+C: digestibles Lys in the period 22 to 28 days for male quails, however, for females observed effect on feed intake and weight gain. In the period 29 to 35 days for males, there was effect for feed intake, methionine and cystine intake, weight gain, carcass ether extract, thigh + drumstick yield, carcass crude protein and nitrogen balance. However, for female quails 29 to 35 days of old, there was no effect on any of the traits studied in the face of relations M+C: digestible Lys. The relations M+C: digestibles Lys which optimized the weight gain were 0.81, 0.75 and 0.77 for periods of one to seven, eight to 14 and 15 to 21 days of old, respectively, for quail both sexes. During periods 22 to 28 and 29 to 35 day old females quails are recommended relations of 0.79 and 0.68, respectively, and for males quails are recommended relations of 0.68 and 0 88 M+C: digestible Lys.