Butter milk is a great marinade for fowl, the healthy bacteria and fats in butter milk help the meat start breaking down to become more tender.
For really good fried chicken.Start by marinading the chicken parts in buttermilk. Then dredge them in flour drop them in a pan full of hot lard and you will have the best fried chicken in the world. Coarse you have to add some other flavors but Im not giving away my secret mixture of eleven herbs and spices.