I want to put my horse on flax seed but not excatly sure how much I need to give him. I want to put it on him because he has dry skin and his feet could use a little help. Plus shining his coat would be nice too. I have him on 4 flakes of alfalfa, about 4 cups of Purina Omolene 100, 1/4cup canola oil, and 1/4cup apple cider vinegar. He is a 2 year old Morgan stud colt. Any ideas?