Hi, Rose.  There is a pear tree inside the run my chickens and ducks use.  They LOVE the windfall pears, and gobble them up like crazy during the summer.  It has not stopped them from laying, it has not slowed them down.  They also love other fruits like strawberries, grapes, blueberries, peaches, etc.  It wouldn't be good to feed them this type of food exclusively b/c they wouldn't be getting enough protein, but for treats, yes, they love it!    RE the feather legged breeds, chickens grow & shed feathers just like humans grow & shed hairs.  If a feather breaks off while in the formative process before the blood supply dries up, yes it would hurt and bleed, but if it grows, dries, and becomes pushed out by a new incoming feather, it would not hurt or bleed.