Hi, we have eleven buff Orpingtons that are about 15 months old. They started laying last october and produced 6-8 eggs a day until about two months ago when they started to slow down to 2-3 eggs a day, now, 1 sometimes none. We feed Layena pellets, some cracked corn and some bread or veggies once in a while. They have two water sources at all times. They go about all day inside a animal wired pasture with two alpacas. Any thoughts?