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Calculation of PrP genotype and NSP type probabilities in Slovenian sheep = Izračun verjetnosti genotipov PrP in skupin NSP pri ovcah v Sloveniji
Gorjanc, Gregor, genetik ; Plohl, Marko, 1984- ; Kompan, Drago
The PrP genotype probabilities in non genotyped Slovenian sheep were calculated. Altogether 36 083 ewes and rams of various breeds were included into analysis. The PrP genotype was known for 10 504 ...animals. Five different PrP alleles were present in the data set. Pedigree and genotype data structure differed between breeds. Iterative allelic peeling with incomplete penetrance model was used for the calculation of genotype probabilities for each animal given the genotype data of relatives. Analyses were performed for each breed separately. Additionally, NSP (National Scrapie Plan) type probabilities and the average NSP value were calculated from the genotype probabilities. Results were presented for live animals only. There were no animals with additionally identified PrP genotype or NSP type with certainty. The PrP genotype was additionally identified with 95% probability for 0.0 to 5.7% animals of different breeds. NSP type was additionally identified with the same probability for 0.0 to 34.9% animals of different breeds. We assume that the low number of additional identifications was due to: a large number of alleles, intermediate allele frequencies, data structure, a uniform prior, and the use of incomplete penetrance model. Additional identifications provided some cost savings, but did not prove useful in the selection for scrapie resistance of the entire population. The average NSP value should be used instead, since it can be calculated for all animals and encompasses all information from genotype probabilities.
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