What's a good feed/grain supplement to help a horse gain weight? Any brands that you find good?
Look into corn oil, beet pulp and alfalfa pellets. Mixed with your grain can work I prefer haylage though
Smartpak is a great thing check ur local tack shop maybe??? good luck!!
I used 14% Purina Strategy and corn oil. For my colts I use also Grow Colt.
Vegetable oil works really well. They're good calories. Beet pulp or senior might help as well.