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It isn't a lethal factor or pedigree you need to watch it is the quality of the animals themselves even animals with a 30 generation pedigree doesn't mean they should be bred. There is no way to know with a 2 week old kit if she will even be breedable. Quality aside there is no gaurentee that she will be big enough to safely pass kits and how good quality is the male, Here is an over view of what they look for at shows
Body should be blocky. If you are looking from above the shoulders should be as wide or about as wide as the hip.
v Face should have a small nose, not long like a rat but rather a short nose.
v Head and neck, the neck should be thick with little or no dip in the neck behind the head.
v Size bigger is better
v Fur. You want density or a lot of fur. To check the density you can blow into the fur and see how much skin you can see. The less you see the better. When you stop blowing see how fast the fur bounces back. You should not be able to see where you blew.
v Finish is the overall appearance. The fur should not look wooly, fur should be flawless
v Color all colors should have a bluish tint. White should be bright the animals should not look reddish, orange or yellow.
v Veiling this is how well the color covers the animal
v Fur Length is very important. If the fur is too long the animal looks shaggy. The overall look should be smooth with no obvious abrupt changes.
v Texture. Fine textured hair that looks soft and flowing is desired. Course hair will not look smooth. If you blow across the fur fine fur will ripple, course hair will lay down
that is just some of what they look at. Good luck. If you are going to breed it is worth the drive to go to a show. People travel pretty far sometimes but if you are breeding it is worth it. Most people buy adult animals when breeding so you know what you are getting