So yesterday I mounted a rabbit feeder in the coop to feed oyster shell. thwy already have it scattered all over the place. is there anything we can do to stop this, or should we just mix it in with the feed? if we do mix it in with the feed what is the proper ratio ie; 10 poinds shell per 50# bag of layer ect. it is fairly expensive to just end up in the composter. TY in advance for any thoughts, ideas, & tips.