In a perfect line, each rat would live to 2.5-3 years of age, with a zero rate of lumps, respiratory illness, ear infections, and other illness. They would die very suddenly with no long gradual decline at the end of life. They would have a bold and confident temperament, actively seeking out human company and entirely relaxed when handled by strangers, but also happy generally with the company of rats and not too “needy” with people – and each one would have that sparkling “x factor” that a rat needs to have to really show itself off on the show bench or become a favourite in the cage.
They would be slightly above average size, with racy, well muscled, long bodies that flow nicely into a long and proportionately thick tail. They would have large well shaped ears set neatly on the head, bold eyes, and a long, wide head with lots of character that is pleasant to look at both straight on and in profile. Their fur would be short, thick, and without moult marks, perfectly meeting the standard for their variety (whatever their variety happens to be).
They would be easy breeders, happily giving birth to a litter of around eight to ten kittens that slowly grow to maturity without any need for extra protein meals or particular supplementation. Each of the kittens would of course grow up to be just as perfect as each other.
It would make rat shows very difficult though, as if each rat was as excellent quality wise as the other, it would be impossible to decide first place. But until that point, we should never be resting on our laurels as breeders and always aim to be improving, because whatever we have isn’t perfection.