Whenever I put my sables on our hay they turn mottled with tan and chocolate areas. The buck I just got has turned chocolate across his back and tan down his sides and he has a show this month. I put them back to mostly pellets and they are slowly going back to normal color. It was interesting but not showable. Any ideas why? We are using 20% protein clover/alfalfa, organic, soil treated with trace minerals twice a year.