Any horse 4 to 5 years or older that spends most of his days relaxing in his pasture while going for the occasional ride is considered a horse at maintenance. Maintenance requirements, nutritionally speaking, are those physiological requirements for respiration, digestion, and other bodily functions.
If your horse has no health issues or dental issues that could impede nutrient digestion, you can implement dietary changes to increase his body weight and condition. The goal is simply to increase energy, or calorie, intake.
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