If you want to discontinue our MUSTAX M+, your horse will of course not lose the muscle mass it has built up, as long as the amount of feed is adjusted and its training workload remains the same. However, if your horse gains too much mass while on M+, you can simply reduce the amount of concentrated feed and continue to feed MUSTAX M+ . As a rule of thumb, 200 g of M+ can replace around 1.5 kg of concentrated feed.