Personally I think temperament is paramount - if the cats are grotty I wouldn't consider breeding them - no, good temperament isn't guarenteed but it blooming well helps if mum and dad are nice. A lot of cat temperament is how they are brought up but if mum is a grotty moo then the kittens are more likely to be a grotty moo. Nice mum, more likely for the kittens to copy her behaviour and be nice themselves. I wouldn't mate my birman to a horrid, aggressive or overly scared cat. GO for temperament as a large consideration in my book.

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