A healthy mane starts with the right feed. Make sure your horse is getting the proper nutrients. Keep the mane free of any dirt, burrs, tangles and so on that can get caught on objects and pull out hair. Use a mane brush or comb and taking a section, starting at the bottom, brush downward gradually moving up the strands until you can comb each section from top to bottom smoothly. Use horse specific products to shampoo and condition the mane. There is grooming spray that can be used inbetween times to help keep tangles to a minimum.