If she looks good on her current diet, that's great it's working. How much of the SC is she getting? If she's chubby on less than 3# a day, than you probably should eliminate it for just a loose vitamin/mineral product. I would wait until you get her home and reevaluate her condition. If she's going to be by herself, she might loose weight just from the stress of no companionship. You're also headed into some dreadful heat that can be very taxing to most horses. You might have trouble keeping her weight up when it's in the 90-100s. Most in the south will put horses out at night and keep them up during the day just for that reason. If you're only feeding one horse, you're going to have spoilage problems with traditional grain mixes in the summer. Pelleted products with a lower moisture content like the SC are going to hold up better.
SC is one of those products that people either love or hate. Have you asked your BO why she uses it and what she likes about it? There's more to it than just having one product for the entire barn.
I would recommend finding a HOW (Purina), TC, Nutrena or other feed manufacturer workshop in your area. Separate out the product indorsements and learn what you can about horse nutrtion. Learn what shortages you hays typically have and how to make up for them.
Last edited by Left Hand Percherons; 04-03-2011 at 12:54 PM.