In 2006 the database service, PolyTrak, was established to examine expressions of polydactylism in the Maine Coon breed. Although not scientific from the standpoint of controlled breeding and observations in a sterile lab, the PolyTrak studies have involved a large number of pedigreed Maine Coon kittens and adults in “real-world” settings in the seven-plus years it has functioned. This observational study continues to compare the scientific studies with data tracking from catteries and pet-homes throughout the world. With over 1300 Maine Coons, no noted detrimental effects from a genetic standpoint have been observed, lending credence to to published studies and observations.
Source: PolyTrak 2014 – Litter & Breeder Tracking