Short answer: Masterfeeds' feeding directions for its Senior horse pellet say: "Feed ½ to 1½ kg per 100 kg body weight along with good quality hay." For a 500 kg horse, that works out to 2.5 to 7.5 kg of Senior a day (our arithmetic on the maker's rate, not a ration for your horse). Masterfeeds adds: "Feeding rates may vary depending on forage quality and horse’s activity level." The full directions are printed on the feed tag of every bag.
How much Masterfeeds Senior per day, by body weight
This is our arithmetic on Masterfeeds' published rate of ½ to 1½ kg per 100 kg of body weight, always alongside good quality hay:
- 300 kg horse: 1.5 to 4.5 kg a day
- 400 kg horse: 2 to 6 kg a day
- 500 kg horse: 2.5 to 7.5 kg a day
- 600 kg horse: 3 to 9 kg a day
- 700 kg horse: 3.5 to 10.5 kg a day
Where your own horse sits inside that range depends on the hay you feed, the work the horse does and its condition. That is a question for your veterinarian or an equine nutritionist, not for a table.
Weigh the horse first
Every Masterfeeds rate is per 100 kg of body weight, so the amount is only as good as the weight you start from. Our guide How to Estimate a Horse's Weight: Weight Tape, Girth Table or Scale sets out the weight-tape method and the girth table from Ontario's horse-weight page.
When an older horse struggles with hay
Masterfeeds' Senior page says: "As the horse ages, problems with their teeth will mean the forage component of their diet will gradually need to be replaced with processed crude fibres." It also says: "Closely monitor your older horse, his or her behaviour, body condition, feed intake, and whether he or she spits out balls of hay. Those are all indicators a change in ration and management is needed."
Masterfeeds' article "Feeding the Active Senior" adds: "For those who have worn teeth or other dental issues, consider adding super fibres such as beet pulp or soy hulls, hay cubes or hay extender products."
A horse that drops feed or spits out balls of hay should have its teeth checked by your veterinarian or an equine dentist before you change the ration.
Where beet pulp fits
Masterfeeds' article on hay shortages names beet pulp, with hay cubes, among the "super fibres" it says "can be fed in lieu of a few pounds of hay." We list plain Beet Pulp Pellets in a 25 kg bag, sold through Masterfeeds.
We found no beet pulp feeding rate on Masterfeeds' website, so we don't give one here. Read the bag tag, and ask your veterinarian or an equine nutritionist how much beet pulp suits your horse and whether to soak it.
Podium Cool Energy uses the same rate
Masterfeeds' feeding directions for Podium (Pellet) are the same as for Senior: "Feed ½ to 1½ kg per 100 kg body weight along with good quality hay." The body-weight list above applies to Podium too. Masterfeeds lists Podium at 12% crude protein and 8% crude fat; Senior at 14% crude protein and 6% crude fat (guaranteed minimums from each product page).
Equine Developer: mares, yearlings and two-year-olds
Masterfeeds' directions for 14% Equine Developer set a different range for each stage:
- Pregnant mares: "Feed ½ to 1 kg of Developer per 100 kg of body weight along with good quality grassy mixed hay according to body condition and quality of hay or grass." For a 500 kg mare, that is 2.5 to 5 kg a day (our arithmetic).
- Lactating mares: "Feed ½ to 1½ kg of Developer per 100 kg of body weight along with good quality mixed hay according to body condition and quality of hay or grass." For a 500 kg mare, 2.5 to 7.5 kg a day.
- Yearlings: "Feed ½ to 1½ kg of Developer per 100 kg body weight along with good quality grassy mixed forage."
- Two-year-olds: "Feed ½ to 1 kg of Developer per 100 kg of body weight along with good quality grassy mixed forage."
Young horses change weight quickly, so re-weigh them as they grow.
How long does a 25 kg bag last?
Our arithmetic for one horse, at a steady daily amount:
- 2.5 kg a day: 10 days
- 5 kg a day: 5 days
- 7.5 kg a day: about 3 days
The Masterfeeds horse feeds we list
- Masterfeeds Senior Horse Pellets - 25 kg
- Masterfeeds Podium Cool Energy Horse Pellets - 25 kg
- Masterfeeds 14% Equine Developer Pellets - 25 kg
- Beet Pulp Pellets - 25 kg
- Every Masterfeeds product we list
- Horse supplies
For other Masterfeeds feeding directions, see our guide Chick Starter, Grower or Layer Feed: When to Switch Chickens.
Feed only as the feed tag directs, and ask your veterinarian before you change an older, pregnant or growing horse's ration.
Sources: Masterfeeds product pages Senior (Pellet), Podium (Pellet) and 14% Equine Developer Pellet (feeding directions and guaranteed analysis), and the Masterfeeds articles "Feeding the Active Senior" and "Hay Shortages and Quality Issues: Finding Fibre Alternatives and Balancing Rations", masterfeeds.com, viewed October 2026. The body-weight amounts and bag days are our arithmetic on Masterfeeds' published rates.