Sarah Hartwell observes;
Polydactyl cats are said to be virtually non-existent in Europe, because "unusual looking cats" were destroyed due to witchcraft superstitions, practically eliminating the trait (Kelly, Larson, 1993). I do not know whether Britain was included in the generic term "Europe" or whether it meant mainland (continental) Europe only. In Norway, polydactyl cats are known as "ship's cats" as the extra toes supposedly gave them better balance on ships in stormy weather; they are not uncommon and polydactyl kittens are sought after pets. Polydactyl random-bred cats have been reported in Sweden though other European cat lovers (locations not reported) had apparently never seen a polydactyl. They are common enough in Britain to be considered unremarkable.
Polydactyl cats were considered "lucky" by sailors. Sailors also believed polydactyl cats to be superior mousers and ratters. Employed as ships' ratters and lucky mascots, they would have reached America with early British settlers hence their greater frequency in Eastern states. A disproportionately high number of "lucky" polydactyl cats, compared to normal-toed cats, would have found their way there. This would lead to a greater proportion of polydactyls than usual for a random-breeding cat population. (Ref 2)
The incidence in the breed today is unknown but is very much reduced from the original estimated 40%. This is because most mainstream breeders, who enjoy showing, do not breed polydactyls as they cannot be shown.
In her 2004 article in the “Maine Attraction”, Lucinda King writes;
“Recent discussions show that many UK breeders oppose the polydactyl, yet research by the writer shows that many of these breeders have polydactyls in the first 5 generations of their pedigrees. Indeed some of the top show cats in the UK come from polydactyl lineage. One argument for this is that a poly to non-poly mating will derive a litter where 40 to 50% of the resultant litter will be polys, but all of the litter usually have increased boning. Hence perhaps thereby producing the size often required to do well in show in the non-poly.
A crude analysis of members web sites of the two GCCF affiliated Maine Coon Clubs in the UK show that of those with pedigrees or pedigree names on their web sites that can be traced, 63% of these breeder members have polydactyls within the first 5 generations of at least one of their Dams pedigrees. This figure is lower for Sires with 37% having polys within the first 5 generations of at least one of their Sires. However, it must be remembered that a Sire will produce many more progeny than that of a Dam.”(Ref 10)
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