Once when I was very ill and couldn't clean the coop at usual time I was worried that the chickens and the neighbours would be ill themselves from the stench! The next day i gave them leftovers and when I went into the coop to collect the eggs the next day I was pleasantly surprised by the wonderful odor! There was a (cooked) head of garlic in that leftover food and the stink was replaced by a ( not overwhelming ) subtle smell of garlic, what a great surprise,