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The study was conducted on Polish Merino (143 ♀ and 39 ♂ ) and old-type Polish Merino sheep (176♀ and 61♂ ) in Brylewo flock (Wielkopolskie Province). The examined sheep were at the age of one year. Prion protein (PrP) genotype was determined in all animals. In both breeds four alleles (ARR, ARQ, AHQ, VRQ) were found. Highly significant effect of breed and insignificant impact of gender within breed...
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