You've just purchased your first horse, a fine looking well-muscled American Quarter Horse. He's a mature gelding at maintenance. Consequently, he should theoretically be able to meet his nutrient requirements from a mixed grass and legume pasture you have available. Unfortunately, you're acquiring your new horse several weeks later than you originally anticipated, and the pasture is well along in physiological maturity. Describe your nutritional dilemma and suggest at least one possible alternative to solve that dilemma.