In all judging situations my four main things are, in no particular order, muscle ( amount of muscle/meat), balance ( does the front end of the animal match the back end of the animal), structure ( how they walk, bone structure), and volume ( how large is the animal). When placing animals, you should follow the winner with like and kind. In market animals you should be looking for finish and muscle/meat. In breeding animals you are looking for muscle that they would pass down in their litters but more importantly structure. If they do not walk well they will not be good breeders. I would suggest going to university websites with a livestock judging section. This will help a lot.
