Polymorphisms of the prnp gene in Moroccan sheep breeds

) that affects sheep and goats. Certain amino acid poly-morphisms of prion protein (PrP) are associated with differ-ent susceptibilities to scrapie. At least 25 codons in the ovine PrP coding region are polymorphic, resulting in 40 different haplotypes (Goldmann and others 2005), although only four polymorphic codons have been linked to scrapie suscepti-bility. The variations at amino acid codons 136 (