The short answer for a Walker at any age
A Tennessee Walking Horse always eats forage first, but the amount of protein, energy, and mineral support layered on top changes sharply with age and work. A nursing foal, a four-year-old in gait training, a broodmare in late pregnancy, and a retired twenty-year-old do not thrive on the same bucket, even if they share the same pasture and hay barn.
Foals, weanlings, and young Walkers in growth
A young Tennessee Walking Horse is building bone, joint, and muscle while learning that smooth gait, so protein quality and mineral balance matter more than sheer calories. Creep feed and then a growth-formulated ration alongside milk and good grass hay support steady, even growth rather than fast, uneven spurts. Watch knees, fetlocks, and overall straightness as he grows, and weigh him regularly, because both underfeeding minerals and pushing excess energy can stress developing joints. Split concentrate into small, frequent meals, since a young stomach handles little-and-often far better than one large grain feed.
The mature Walker in work
A mature Tennessee Walking Horse in regular riding needs energy matched to the work actually done, not to the work planned for next month. A lightly ridden trail Walker may hold condition on forage alone with a vitamin and mineral balancer, while one schooling daily, showing, or covering long trail miles will need added energy from concentrate or fat sources. Walkers are often easy keepers with efficient metabolisms, so add feed in small steps and recheck condition over the topline, ribs, and crest before adding more. Too much grain for too little work shows up first as a cresty neck, fat pads behind the shoulder, and excitability under saddle.
Broodmares: pregnancy and nursing change the math
A pregnant Tennessee Walking Horse mare needs little extra for most of gestation, then considerably more protein, energy, and minerals in the final months as the foal grows fastest. Once she foals, nursing pushes her needs higher than at any other stage of her life, and a mare milking well can lose topline and rib cover quickly if her ration is not raised in step. Keep clean water constantly available, because milk production collapses without it, and increase feed gradually after foaling rather than in one abrupt jump. Her foal's creep area should let him nibble her ration safely without letting her steal his growth feed back.
Senior Walkers and worn teeth
A senior Tennessee Walking Horse may eat the same hay as always yet steadily lose condition, because worn or missing teeth leave long, unchewed stems in his manure and reduce what he actually extracts. Senior-formulated feeds that soak into a soft mash, soaked hay pellets or cubes, and chopped forage replace the chewing his molars can no longer do. Protein needs often rise again in old age to hold muscle along the back and hindquarters, and smaller, more frequent soaked meals suit an older gut. Have teeth checked regularly, and treat a senior who quids hay or drops grain as a feeding problem to solve promptly, not as normal aging to ignore.
Making stage changes gradually and safely
Every Tennessee Walking Horse, at every stage, needs feed changes introduced over many days so hindgut microbes can adapt. Weigh hay rather than guessing by the flake, use a weight tape on a schedule, and score condition by hand over ribs, withers, and tailhead instead of judging by a winter coat. Separate horses at feeding time where possible, because a dominant younger Walker will quietly eat a senior's carefully planned mash as well as his own. Call your veterinarian if a Walker at any stage loses weight despite eating well, gains rapidly on little feed, or shows repeated discomfort after meals, since those patterns deserve investigation beyond ration tweaks.
Keeping each Walker's stage, ration, and condition notes assigned and checked off in KinsLe Care Teams means whoever feeds that morning works from the current plan for that horse, not from barn habit.