My horse has mild EPSM, so in terms of getting enough calories/energy she will be getting all her energy/fat via oil. Since she cannot process sugars for energy we can't feed most grains anyway. Basically, if I do not need grain to supplement for energy or calories and I switch to providing my horse with free choice high quality hay fed with a slow feeder net/feeder then do I need any ration balancer? I know that Vitamin E and Selenium are a concern for EPSM horses so I can supplement with those individually if needed.
I would only be giving my horse alfalfa pellets that can absorb her 2 cups of vegetable oil and provide a base for her joint supplement and Vitamin E/Selenium if needed.