In my opinion there is no one right way.because in my feeling is that a northern deer needs to eat more than a southern deer because of weather condtions.So being that the nortern deer needs food that will have a higher protein levels.Plus free roaming deer will depend on natural foods.farm raised deer have been fed custom deer feeds.Just like we have many horse farmers having different feeds that they have for their horses.same thing with cattle farmers.So look at that way.I'm no expert,but my experiances are different than the next guy.Just because the deer farmer has his feed does not mean it will work with every other deer out their.Just remember what you said."the deer breeders".