So I've been feeding my horse flax and biotin as a supplement, and she has been rugged all winter. She's a paint, black and white, and her black patches are really black and shiny now from the lack of sun and retained oils I imagine. I'm starting to worry about the sun exposure now, as she can turn a diarrhea brown in the summer and her mane and tail get all maroon looking, lol. What can I give her to prevent this from happening? She's on 8 hour turnout in a huge field. I've looked at some supplements (i.e. Grand Coat, Black as Knight, etc.) I don't know that I like the idea of keeping her constantly rugged throughout the summer, (I'm thinking just a fly sheet with added UV protection as needed) but even this won't protect her mane and tail. What do you guys do?