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hi, chicken droppings were put in to chicken food in the eightys, I observed this both in the animal food production plant and at a battery chicken farm just out side london, where they would heap the droppings into a big rotating dryer and bag up the droppings at the other end. apparantley some bod found that there was protein in the droppings and didn't want to waste it. I worked in the bussiness for seven years and it went on all that time at least. mind you, that was the time when they were feeding ground up dead cows back to the cows in the animal food, which we drank as milk.
alf.