Genetic Associations of Farrowing Length in Two Maternal Lines of Pigs

Thursday, August 21, 2014: 4:45 PM
Bayshore Grand Ballroom B-C (The Westin Bayshore)
Ricardo Zanella , EMBRAPA Swine and Poultry, Concórdia, Brazil
Adriana M.G. Ibelli , EMBRAPA Swine and Poultry, Concórdia, Brazil
Jane O. Peixoto , EMBRAPA Swine and Poultry, Concórdia, Brazil
Maurício E. Cantão , EMBRAPA Swine and Poultry, Concórdia, Brazil
Marcos V. G. B. da Silva , Embrapa Dairy Cattle, Juiz de Fora, Brazil
Poliana F. Giachetto , Embrapa Agricultural Informatics, Campinas, Brazil
Marcelo Freitas , BRF S/A, Curitiba, Brazil
Jader Lopes , BRF S/A, Curitiba, Brazil
Mônica C. Ledur , EMBRAPA Swine and Poultry, Concórdia, Brazil
Abstract Text:

Reproductive success has a direct impact on the economy and profitability of pork production. Prolonged farrowing is negatively correlated with number of piglets born alive and decreased fertility in subsequent breeding-season. To better understand the genetics involved with birth traits, a genome-wide-association-study was conducted to identify SNPs associated with farrowing length (FL) in two swine breeds. Five chromosomal regions involved with FL were identified using the additive/additive+dominance models in Landrace breed: on SSC0/SSC1/SSC2/SSC4/SSC13, and two regions on SSC15 when the additive+dominance model was tested. For the Large White breed, four regions (SSC4/SSC9/SSC12/SSCX) were associated with FL using the additive/additive+dominance models. When tested the additive+dominance effects, five chromosomal regions were associated with FL: on SSC0/SSC1/SSC4/SSC5/SSC6. Identification of markers associated with FL might unravel genes involved with birth traits. Hence, genetic selection can be applied to optimize farrowing time, according to the desirable breeding goals.



farrowing length