Which of these three would be better for a hard keeper, and why? Opinions please! :)
DuMORŽ EquiStages Horse Feed, 50 lb. - 5109922 | Tractor Supply Company
NutrenaŽ SafeChoiceŽ Horse Feed, 50 lb. - 2802262 | Tractor Supply Company
NutrenaŽ Life DesignŽ Prime Horse Feed, 50 lb. - 2802296 | Tractor Supply Company
The horse in question is a 7 year old APHA. He gets ridden for 45 minutes to one hour almost every day. He's on free choice hay and has no health problems. He's not thriving on E32, so I'd like to check these out.