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2003 | 44 | 2 | 191-195
Article title

Prion octapeptide-repeat polymorphism in Polish Black-and-White cattle

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Languages of publication
EN
Abstracts
EN
The study was carried out in a Polish Black-and-White cattle population, represented by 167 AI sires, 200 young tested bulls, 190 bull-dams, and 606 randomly chosen cows from commercial herds. The fragment of the bovine prion protein gene (PRNP) coding the octapeptide-repeat sequence, was identified by PCR analysis. Two different gene variants of 349 bp and 373 bp in size, produced three genotypes: PRNP 6/6, PRNP 6/5 and PRNP 5/5, respectively. Allele frequency in all examined populations, on average 0.894 for PRNP 6 and 0.106 for PRNP 5, shows a significant difference between the group of cows from commercial herds, characterised by high frequency of PRNP 5 (q = 0.137) in comparison to AI sires (q = 0.077), young tested bulls (q = 0.052) and bull-dams (q = 0.084). Moreover, both analysed female groups of bull-dams and cows from commercial herds are distinguished by the presence of PRNP 5/5 homozygous animals, which were not recorded in the AI sires and young tested bulls, and had never been recognised in earlier examined Holstein-Friesian populations. Analysis of the genetic equilibrium indicates a very high conformity between observed and expected number of animals in the separate PRNP genotype groups. However, some tendency of difference is observed in highly selected cows, qualified as bull-dams on the basis of very high level of milk performance traits.
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Year
Volume
44
Issue
2
Pages
191-195
Physical description
Contributors
author
author
References
Document Type
SHORT COMMUNICA
Publication order reference
K. Walawski, Department of Animal Genetics, University of Warmia and Mazury in Olsztyn, ul. M.Oczapowskiego 5, 10-957 Olsztyn, Poland
Identifiers
YADDA identifier
bwmeta1.element.element-from-psjc-b7fe5824-48f9-340f-9faa-88b4fce0aba0
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