Is FCKS sex linked? Picture

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Many people who experience isolated instances of FCKS, or have some kittens go flat in a litter but not others, notice that it seems to affect male kittens more often than females. Going by cases notified to me there certainly seem to be noticeably more male cases of FCKS than female, and several breeders have asked if it can be sex-linked, since only their males are affected. Possibly there is some relation between male kittens being bigger than females on the whole (breeders have noticed that often it is the kittens who start out being the heaviest and fattest who seem to get FCKS, not the skinny ones, however this is not regular enough to be reliable, and I don't have enough detail on all the cases notified to me to be able to give any statistical data on the possibility).

Since both sexes get FCKS the likelihood is that the preponderance of male kittens suffering from it is related to relative size and weight, and that it is not sex-linked. Possibly, if we ever get enough data about the problem, and can raise funds to do a veterinary study, it may be worth examining something like testosterone levels in affected and unaffected kittens.

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