Data/hora: 19/06/2024 17:41:58

Biblioteca(s): | Embrapa Recursos Genéticos e Biotecnologia.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 2
Data corrente: | 29/01/2013
Data da última atualização: | 03/03/2023
Autoria: | SILVA, A. C. M.; PAIVA, S. R.; ALBUQUERQUE, M. S. M.; EGITO, A. A. do; SANTOS, S. A.; LIMA, F. C.; CASTRO, S. T. R.; MARIANTE, A. da S.; CORREA, P. S.; MCMANUS, C. M.
Afiliação: | UnB; UnB; UnB; ANDREA ALVES DO EGITO, CNPGC; SANDRA APARECIDA SANTOS, CPAP; UNIVERSIDADE ESTADUAL DO MARANHÃO; SILVIA TEREZA RIBEIRO CASTRO, CENARGEN; ARTHUR DA SILVA MARIANTE, CENARGEN; UFRGS; UFRGS.
Título: | Genetic variability in local Brazilian horse lines using microsatellite markers.
Ano de publicação: | 2012
Fonte/Imprenta: | Genetics and Molecular Research, v. 11, n.2, p. 881-890, 2012.
Idioma: | Inglês
Conteúdo: | Genetic variability at 11 microsatellite markers was analyzed in five naturalized/local Brazilian horse breeds or genetic groups. Blood samples were collected from 328 animals of the breeds Campeira (Santa Catarina State), Lavradeira (Roraima State), Pantaneira (Pantanal Mato-Grossense), Mangalarga Marchador (Minas Gerais State), as well as the genetic group Baixadeiro (Maranhão State), and the exotic breeds English Thoroughbred and Arab. We found significant genetic variability within evaluated microsatellite loci, with observed heterozygosis varying between 0.426 and 0.768 and polymorphism information content values of 0.751 to 0.914. All breeds showed high inbreeding coefficients and were not in Hardy-Weinberg equilibrium. The smallest genetic distance was seen between the Pantaneira and Arab breeds. The principal component analyzes and Bayesian approach demonstrated that the exotic breeds have had a significant influence on the genetic formation of the local breeds, with introgression of English Throroughbred in Pantaneira and Lavradeira, as well as genetic proximity between the Arab, Pantaneira and Mangalarga Marchador populations. This study shows the need to conserve traits acquired by naturalized horse breeds over centuries of natural selection in Brazil due to the genetic uniqueness of each group, suggesting a reduced gene flow between them. These results reinforce the need to include these herds in animal genetic resource conservation programs to maximize the genetic variability and conserve useful allele combinations.
Palavras-Chave: | Conservation genetics; Molecular markers.
Thesagro: | Equus Caballus.
Thesaurus Nal: | animal genetic resources; livestock.
Categoria do assunto: | G Melhoramento Genético
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/64128/1/gmr1483.pdf
Registro original: | Embrapa Recursos Genéticos e Biotecnologia (CENARGEN)
Exemplares: | CENARGEN - (34269-1) - UPC - AP - DD - SP 20361 -  - SP 20361 - DIS