If you have ever brought an ex-racehorse home and watched them drop weight in the first few weeks despite eating what seems like a mountain of feed, you are not doing anything wrong. Working out what to feed an off the track thoroughbred is one of the trickiest parts of those early months, because the diet that kept them fit enough to race is not built for the job they are doing now.
Why their old feed doesn't work anymore
Racehorses eat for speed and recovery. Big grain rations, high energy, quick turnover, because their whole job is short bursts of maximum effort followed by rest. The second that horse comes off the track, that same diet becomes way more fuel than they need for hacking, flatwork or paddock life, and it shows up as fizzy behaviour, weight that will not settle, or a gut that is still adjusting to a completely different routine. It is not that the horse is being naughty or hard to handle. Their body is still running on race fuel while their job has changed completely.
This is usually the point where owners either panic and cut everything back too fast, or keep feeding what the trainer sent home with a bag of chaff and hope for the best. Neither works well. The transition needs to happen gradually, over several weeks, so the gut has time to adjust without the horse crashing in condition.
What to actually feed in the first few weeks
Forage first, always. A thoroughbred fresh off the track often has an unsettled gut from stress, travel and a low forage diet, so getting good quality hay or pasture into them consistently is the single biggest thing you can do early on. From there, a low starch, high fibre feed designed for horses in light work is usually a safer landing spot than anything marketed for performance or racing, at least until you know how your horse is settling.
Weight gain (or loss) in these first months is rarely a straight line. Some horses drop condition initially as the stress of the move and a new routine catches up with them, then start climbing again once they settle. Others hold weight fine but need adjusting for energy, because a horse that was doing fast work six days a week and is now hacking three times a week does not need race level kilojoules just to stay round. Is your horse actually underweight, or just different from the shape you are used to seeing on a racehorse? That question alone saves a lot of unnecessary feed changes.
Watching condition as things change
The biggest mistake people make with a new OTTB is setting a feeding plan in week one and leaving it there. These horses change fast in the first three to six months, sometimes week to week, as muscle patterns shift from a racing frame to something more suited to their new job. What worked in week two might be too much or too little by week eight.
Running your hand along the ribs and topline regularly, and actually writing down what you see rather than trusting memory, makes a real difference here. It is easy to feel like nothing has changed when actually your horse has quietly dropped or gained condition over a month. This is one of those spots where keeping a simple record, even just a photo and a note every couple of weeks, saves you from reacting too late. A lot of EquiCare users end up using their horse's profile for exactly this, logging weight and condition notes alongside training so the pattern is obvious instead of guesswork.
When to bring in a vet or nutritionist
If your horse is not settling after a few weeks of consistent forage and a sensible low starch feed, or you are seeing ongoing behavioural changes, ulcer symptoms, or condition that will not shift either way, that is the point to bring in a vet or an equine nutritionist rather than keep guessing. Straight off the track horses have a genuinely higher rate of gastric ulcers, and a horse that seems fussy, girthy or reluctant under saddle is sometimes telling you something about their gut before it shows up anywhere else. There is no prize for figuring it out alone, and a proper feed plan from someone qualified will save you months of trial and error.
Feeding an OTTB well is less about finding the perfect bag of feed and more about paying close attention for those first few months and being willing to adjust as your horse tells you what they need. Give it time, watch closely, and trust that the horse in front of you now is not the same horse that left the track.
