Detecção de locos de características quantitativas nos cromossomos 16, 17 e 18 em suínos

• Ano de defesa: 2007
• Autor(a) principal: Paixão, Débora Martins
• Orientador(a): Guimarães, Simone Eliza Facioni
• Banca de defesa: Paiva, Samuel Rezende , Machado, Marco Antonio
• 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: Suíno; Genética; Locos de caracteres quantitativos; Marcadores genéticos; Cromossomos; Carcaças; Carne de porco; Qualidade
• Palavras-chave em Inglês: Swine; Genetics; Quantitative trait locos; Genetic markers; Chromosome; Carcass; Pork quality
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::GENETICA E MELHORAMENTO DOS ANIMAIS DOMESTICOS
• Link de acesso: http://locus.ufv.br/handle/123456789/5834

The objective of this study was mapping QTL on pig chromosomes 16, 17 and 18 and associate them to performance, carcass, internal organs, viscera, carcass cuts and meat quality traits. A F2 population was produced by crossing two naturalized Brazilian Piau sires and 18 commercial dams (Landrace x Large White x Pietrain). The population was genotyped for 11 microsatellite markers. After the genotype scoring, it was constructed the linkage map for these markers in the population. The microsatellites markers were considered appropriate for quantitative trait analysis. It was analyzed their values for observed heterogosity (Ho), expected heterozigosity (He) and polymorphic information content (PIC). The evaluation of the four loci amplified in the SSC16 found average values of Ho, He; and PIC of 0,67, 0,57 and 0,50, respectively. In the SSC17 the average values for Ho, He and PIC of 0,72, 0,61 and 0,56, respectively for the four amplified loci. And in the SSC18, average values of Ho, He and PIC were 0,67, 0,63 and 0,59, respectively for each one of three loci. Data were analyzed by multiple regressions by F2 mapping method using the QTLEXPRESS software. Eleven QTL were mapped and not yet described in the literature: teat number, cooking loss, redness, lower backfat thickness after last lumbar vertebrae, bacon depth, heart weight and lung weight on SSC16. QTL for weight at 63 and 77 days of age were assigned on chromosome 17. QTL for weight at 21 days of age and slaughter age were identified on SSC18. Four QTL Already described in another populations were also identified: weight at 21 days of age on SSC16, backfat thickness after last lumbar vertebrae and after the last rib (at 6,5 cm from the midline ) on SSC17 backfat thickness after last lumbar vertebrae and after the last rib (at 6,5 cm from the midline) and total loss on SSC18. The generated information of significant QTL is useful for future studies dealing with fine mapping to identify genes that could provide a better understanding of the production traits in pigs.