Stay with organic. There's arsenic in the other feed due to the chickens never seeing the light of day and being in crowded conditions as well as a host of other chemicals. ALL BLESSED BY THE USDA.
The arsenic gives the chicken skin that nice fresh "pink" glow.
http://www.nytimes.com/2012/04/05/op...r-chicken.html
Poultry-growing literature has recommended
Benadryl to reduce anxiety among chickens, apparently because stressed chickens have tougher meat and grow more slowly.
Tylenol and Prozac presumably serve the same purpose.
Researchers found that most feather-meal samples contained caffeine. It turns out that chickens are sometimes fed coffee pulp and green tea powder to keep them awake so that they can spend more time eating. (Is that why they need the Benadryl, to calm them down?)