Mapeamento de QTLs para características de crescimento e de resistência no cromossomo 14 de bovinos F2 provenientes de um cruzamento Gir x Holandês

Detalhes bibliográficos
Ano de defesa: 2006
Autor(a) principal: Miyata, Marcelo
Orientador(a): Regitano, Luciana Correia de Almeida
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de São Carlos
Programa de Pós-Graduação: Programa de Pós-Graduação em Genética Evolutiva e Biologia Molecular - PPGGEv
Departamento: Não Informado pela instituição
País: BR
Palavras-chave em Português:
QTL
Área do conhecimento CNPq:
Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/5432
Resumo: Brazil possesses the largest commercial bovine herd in the world and cattle represents about 43% of agricultural PIB of Brazil. Crossing Bos taurus and Bos indicus species allows the combination of traits of production from the first specie and of rusticity from the second specie for the genetic improvement of the bovines. Due to the economical relevance of livestock in Brazil, the search for regions in the genome that contribute to prodution traits is object of many studies including traits such as meat yield, precocity of growth and many weight measures (eg. birth weight, yearling weight). The endoparasites and ectoparasites have great economical relevance, once the growth losses and production (meat and milk) affect the bovine herd and consequently, the producer and consumer. The objective of this work was to map QTL (Quantitative Trait Loci) for growth traits and for resistance to ectoparasite and endoparasites through the BTA14 scan, using microssatellite markers in a F2 population Holstein x Gyr. The QTL mapping for the trait birth weight (BW) suggested a QTL (P <0.05) at 1 cM from centromere and for the weight at 60 days (P60), a suggestive QTL (P <0.05) was found at 0 cM from centromere. The mapping for resistance to the ectoparasite Boophilus microplus revealed a significant QTL (P<0.01) at 22 cM from centromere but no association was observed for endoparasites. Together, the results found in this work suggest the possibility to map regions of the bovine genome that affect quantitative traits, like growth and resistance, by means of microssatellite markers.