Quality not so much more protien as the harder you work the more calories burn and need to be replaced and you need an all around good supplement intake on all your vits. and minerals and some higher fat. You also need to take into consideration when you start working harder you need to feed muscle for fatigue and loss of fluids replenish. I personally feed my hard keeper Triple Crown Complete LOVE IT! I have also added soaked beet pulp for extra water intake. You could also go with a ration balancer and add alfalfa pellets and beet pulp. I guess it depends what you have available in your area locally and your budget. Your horse isn't gettin enough nutritional value from 1/2 lb of sweet feed a day.