abbreviation of the positions 136, 154, 171 of the sheep prion protein. A simple blood test reveals the allele of the sheep, and many countries are actively breeding away the VRQ allele. Double ARR does not produce full protection, but does provide significant resistance and slowdown.

Out of fear of BSE-like transmission, many European countries banned some traditional sheep or goat products made without removing the spinal cord, such as smalahove and smokie.