Comparação de diferentes cenários de métodos de seleção, tipos de acasalamento e razões sexuais em características de codornas de corte usando simulação

• Ano de defesa: 2013
• Autor(a) principal: Lehner, Helmut Gonçalves
• Orientador(a): Torres, Robledo de Almeida
• Banca de defesa: Barreto, Sérgio Luiz de Toledo , Carneiro, Antônio Policarpo Souza
• 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: Avaliação genética; Coturnix coturnix; Simulação de dados; Tamanho efetivo
• Palavras-chave em Inglês: Genetic evaluation; Coturnix coturnix; Simulated data; Effective size
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::GENETICA E MELHORAMENTO DOS ANIMAIS DOMESTICOS
• Link de acesso: http://locus.ufv.br/handle/123456789/5787

This study aimed to compare different scenarios including methods of selection, mating and sexual reasons economic interest characteristics of quails in the long term. Were simulated for each trait (slaughter weight, carcass yield and mortality) different genomes similar to the European quail through the computer program GENESYS. From each genome was originally obtained from a population base of 1200 patients (600 males and 600 females) heterozygotes with no relationship to one another. Subsequently, the initial population was formed by random sampling and mating of 204 males and 204 females obtaining an initial population of 2040 individuals corresponding to an average number of offspring per female 10. Formed after the initial populations began the formation of the selected populations, a total of 24 for each characteristic, corresponding to scenarios formed by two selection methods (SI= Single and BP= BLUP), four sex ratios (D1= 204 males: 204 females; D2= 102 males: 204 females; D3= 68 males: 204 females, and D4= 51 males: 204 females) and three mating systems (RAA= Players randomly mated; EIC= Deleting Brothers Completion; EICMI= Deleting Brothers Full and Half-Brothers) over 20 generations with 10 repetitions. Populations under selection were compared using the parameters: phenotypic value, the average coefficient of inbreeding, fixation of favorable and unfavorable alleles and selection limit. It was observed that the method of selection, the phenotypic values were generally higher for the BLUP, especially in the characteristic slaughter weight. However, individuals undergoing BLUP resulted in higher increase in inbreeding coefficient, the greater percentage of fixation favorable and unfavorable alleles and greater reduction in threshold selection. The increase in sex ratios mainly influenced coefficients of inbreeding within the population. Mating systems that excluded the crossing among relatives (EIC and EICMI) were instrumental in reducing inbreeding, besides providing an increased fixation of favorable alleles and reduction in unfavorable allele fixation and selection limit.