You may have answered this before, I'm not sure if I missed it. Do straight eared Scottish Folds have the same cartilage problems as the folded ones?
Sueanoi here,
Usually no. The problem from that gene affect the entire body's cartilage.
Unless the gene is actually present, and the cartilage in the ears are ones that happen to be less affected.
I more often see problems from fold eared cats.
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recently i've seen an uptick in demonizing scottish fold breeding, due to FOCD (feline osteochondrodysplasia), the gene variant that gives folds their iconic ears. im very sleep deprived so im only going to give a basic rundown that i will hopefully word correctly but if anyone is genuinely interested i can go more into it,
FOCD is caused by a single gene variant in TRPV4, which causes the cartilage to change, giving the ears their fold.
a lot of the discourse i've seen is very surface level, showing xrays of homozygous cats with malicious FOCD, as all homozygous folds have, and acting as if all scottish folds will end up that way.
they won't, right? well, no, not necessarily. but it is true every scottish fold has FOCD, or else they wouldn't be scottish folds, and would be classified as scottish straights which i will get into later. also, homozygous means having 2 copies of the same allele for a trait, with heterozygous meaning you have 2 different alleles for it.
despite every fold having it, there are 3 "variants" of fold i will use to explain the situation. straights, as in scottish straights that do not have FOCD, homozygous folds, which i suppose you can compare to a double merle dog. if 2 folds are bred, the kittens will be homozygous, which causes malicious FOCD, which is extremely painful and can warrant euthanasia, and then there are heterozygous folds, which come from a fold x straight cat, or just any cat that isn't a fold. heterozygous folds have been shown to have much lower chances of developing malicious FOCD, but it does still happen. about that,
there have been very few studies with proven wellbred purebred folds, i can only think of one close right now, "Osteochondrodysplasia in Scottish Fold cats" R MALIK, GS ALLAN, CR HOWLETT, DE THOMPSON, G JAMES, C McWHIRTER and K KENDALL (1999).
pedigree information was available for nine of the ten cats studied, all should have been heterozygous based on their parentage. 8 were from fold x scottish matings but one was from a fold x british mating. all ten folds showed some degree of FOCD on xray but there was wide variation in the severity and rate of progress of the condition, ranging from two cats euthanized at 6 and 21 months, to the cats aged 4, 5, and 11 years who were from the breeding cattery聽 and were reportedly asymptomatic. the 11 year old had milder changes on xray than the 4 year old.
this study, being 25 years old, obviously doesn't fit today's standards i would say. it needs to be redone, with proven cats from well known responsible catteries. i have a couple more off the top of my head that aren't nearly as in depth, but provide useful information
what is the solution, and conclusion? are scottish folds inherently bad? well, as much as i hate to say it, we don't know. there isn't enough evidence to say yes, and not enough to say no for absolute certain. another study NEEDS to be done, preferably with CFA or TICA champions which definitely would weed out 99% of byb cats, although studying them aswell to compare is also crucial. i would say, the outlook is good, but rocky. the study has proven difficult to make happen, and i believe that ties into the overall attitude of most of the cat show world, but i may get into that some other time. in the meantime, responsible breeders should continue rigorous health testing before breeding, never breeding 2 folds together (including being wary of straights, as if you don't know the exact background of it, it may be a fold genetically that had it's ears stand back up in kittenhood), and soft-culling any cats that show any signs of FOCD that go past the ears. sillysealfan OUT
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