Do I need to test at Codon 136?
Because testing is not free, the goal is to minimize the amount of testing you need to do. At Gene Check, we continue to discourage routine testing at codon 136. First of all, the incidence of strain A scrapie in the US is low. Secondly, if you are breeding toward RR at codon 171, you are automatically breeding toward AA at codon 136. If you are selling RR animals, you do not need to test them at codon 136. If you are selling QR animals, as most of us still are, you may want to consider testing those at Codon 136.
