the nutrition of the animal is found in the organs, fat, skin, and bone marrow. the muscle part has the least nutrition
and yes obviously how you cook food affects the nutritional value. I don't see wolves or lions killing an animal then cooking it. we cook our food because we cannot handle bacteria so you gotta cook it or risk food poisoning unless it is really really local and fresh. doesn't say much about the quality of our food. never order undercooked food from a restaurant, be smart!