I breed both blues and siamese. I don't have any aggression issues or nursing problems, but I do have more blues, solid, hooded, any blue at all, that get inner ear infections and have respiratory problems. I produce a LOT of rats and it is the blues that have these problems the most. I rarely see it until they're 3 to 4 months old. My vet told me that the immunity the get from nursing carries on until about the 3 to 4 month range and that's why it shows up then. I used to treat with tetracycline, now they're just feeders when that happens. My hairless are the same way, just genetically weaker I'm thinking. All of my blues and siamese are gentle, all my rats in general are. But, I've been culling any aggressive adults for years.
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