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1 Animal Science Papers and Reports

1 2013

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Association study of PIT1 and GHRH SNPs with economically important traits in pigs of three breeds reared in Poland

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Piorkowska K. , Ropka-Molik K. , Oczkowicz M. , Rozycki M. , Zukowski K.

tom 31

nr 4

Using the GLM procedure an association was analysed between PIT1 and GHRH SNPS and economically important traits in pigs of three breeds reared in Poland. Significant effect of GHRH/AluI SNP was observed on several quality traits such as water-holding capacity and meat colour (A,B and L*) in Polish Large White pigs (P<0.05), with the differences between alternative homozygotes being 8.1%, and 5% (meat colour), and 16% and 3% (WHC), respectively. With respect to the PIT1 gene polymorphism, it was found that pigs carrying AA genotype presented lower values of growth traits such as feed:gain ratio, daily feed intake and number of days on test compared to BB animals (P<0.05) as well as lower pH24 in loin and ham. In turn, heterozygous pigs (AB) had the highest level of fat and the lowest values of meat traits when compared to both homozygotes. It was concluded that polymorphisms in GHRH and PIT1 genes were not directly associated with quality and carcass traits, and likely they are linked to genetic markers localized on chromosomes 17 and 13. Therefore,further investigations should aim at thorough testing of GHRH and PIT1 loci.