UDDER! Really, the entire picture. The cow needs to look like a cow, have a great udder, and have a good looking calf. We have shown pairs for 4 years now, and are sometimes surprised at what a judge will allow on the cow to place at the top. Seen a three quartered cow, fit up pretty good, win some big shows. You can hide a bad quarter with hair, if you have any! Ours never do (have hair, that is) !!! ;D