The definition and abbreviation for Potentially Hazardous Food (Time/Temperature Control for Safety Food) or PHF/TCS should be modified to drop the reference to potentially hazardous food and PHF.
Yes, as a treat apples are fine for chickens. Some will say it is best not to feed them too many apples as the seed of an apple has a small amount of arsenic in it. I have an orchard on my property and in the fall, the chickens run there first thing in the morning. Never had a chicken drop dead under an apple tree.
Came to your website as we have a lone robin trying to feed off the suet droppings from our bird feeder. We didn't know what to give it to eat but we do now. We mixed up some blueberries, apples and walnuts for him and he's eating! Had a huge flock eat all the crabapples from 2 trees in our yard several months ago.