Try to avoid any rats with a blaze face or husky markings (I know there are others but my mind is stuck). If you need pics for examples just let me know. Husky and blazes can carry the megacolon gene. I have a husky female breeder whose been wonderful and never produced any problem babies but recently a breeder male in our colony who is a blaze faced with dalmationing produced a megacolon offspring and a number of others (all different mothers) who were just not right. He's out of the breeding rotation (will become Mikey's pet) and I won't use a blaze again....megacolon is terrible to see!

Personally I love hooded rats of any color and selfs (all one color). I have found albino females to be a bit more aggressive as mothers so I don't use them anymore and for some reason many of my pure black rats have a bit of attitude. That may be genetic though as my pure black stud rat (and their father) is a great breeder and not mean, but not particularily friendly.