I just want to recommend a tool to any of you who care for a horse: FeedXL. It now is available for free for 3 horse profiles. You can add just about any feed or supplement and it will calculate macro and micro nutrients, ratios, calories, and cost per day, and provide recommendations/alert you to any imbalances. If you have a horse that isn't keeping weight but "should" or a chunk monkey who you want to lose weight but keep up the right nutrition, this is super helpful! And again, free!!
https://feedxl.com/