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Association of Polymorphisms in Epidermal Growth Factor, Prostaglandin-endoperoxide Synthase 2 and Prolactin Receptor Genes with Semen Quality in Duroc Boars

  • Huang, S.Y. (Division of Biotechnology, Animal Technology Institute Taiwan) ;
  • Song, H.L. (Division of Biotechnology, Animal Technology Institute Taiwan) ;
  • Lin, E.-C. (Department of Animal Science and Technology, National Taiwan University) ;
  • Lee, W.C. (Division of Biotechnology, Animal Technology Institute Taiwan) ;
  • Chiang, J.C. (Division of Animal Resources, Animal Technology Institute Taiwan) ;
  • Tsou, H.L. (Division of Animal Resources, Animal Technology Institute Taiwan)
  • Received : 2005.07.05
  • Accepted : 2005.12.22
  • Published : 2006.06.01

Abstract

The quality characteristics of semen are important indicators of the fertility of a boar. Development of genetic markers for the semen quality in boars will be beneficial to the improvement of porcine fertility. We investigated the relationship between the polymorphisms of epidermal growth factor (EGF), prostaglandin-endoperoxide synthase 2 (PTGS2) and prolactin receptor (PRLR) genes, and semen quality traits in boars. The genomic DNA of 233 boars (157 Duroc and 86 Landrace) from a central testing station was subjected to genotyping for surveying gene frequency. The EGF, PTGS2 and PRLR genotypes were determined using the restriction fragment length polymorphism method. Thirty-seven normal, mature Duroc boars from an AI center were also genotyped and their semen quality traits were collected. The effect of genotype on semen quality traits was analyzed by the least-squares means method using data corrected for season. The frequencies of the AA genotype of EGF, PTGS2 and PRLR in Duroc boars were 0.14, 0.01 and 0.66, respectively. In Landrace, the frequencies of the AA genotype were 0.03, 0.09 and 0.62, respectively. Boars with the BB genotype in EGF, with the AB genotype in PTGS2 and with the AA genotype in PRLR had significantly better semen quality with a higher percentage of normal sperm and a lower percentage of immature sperm than those with other genotypes. These findings imply that polymorphisms of EGF, PTGS2 and PRLR genes might be used as markers for improving the semen quality of boars.

Keywords

Boar;Epidermal Growth Factor Gene;Prolactin Receptor Gene;Prostaglandin-endoperoxide Synthase 2 Gene;Restriction Fragment Length Polymorphism;Semen Quality

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