I guess every breed is different. With Mau's for instance it's standard to ban putting male progeny on the active though I'm yet to see one with any restriction on female kittens and that's mostly because right now no stud in the country is related to any other stud, they essentially force anyone wanting a stud to import one. Good for the gene pool, a right bastard for those wanting to do it. Lucky for us there's a fair handful of brave souls prepared to do it! Makes the stud fees a ballache though - £450 pretty standard

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Lily - silver Egyptian Mau
Jasper - Burmese X moggy - missing!
Electra - silver Egyptian Mau
(Truffles - chocolate tortie syrian hammy - bye little one, I miss you)
And 6 little balls of silver spotty fluff! OMG KITTENZ etc