When I bought my horse he was a lovely liver chestnut, but that colour never came back and in his prime he was a very orange chestnut. Now he is 21 his coat is coming through as liver chestnut again this spring. I am puzzled and have been mulling over what he has been eating. He gets a Progressive Earth mineral supplement, Fast Fibre and linseed with chaff and the ONLY thing that has altered is the chaff. For years I fed him one with alphalfa, the Top Spec Lite for instance, but I changed to a grass and oat straw chaff a few months ago. Could this have made the difference?