Dr. Brian Nielsen has conducted multiple studies funded by the American Quarter Horse Association (AQHA) Foundation regarding bone mass and his findings have been consistent – and surprising. Though horses kept in stalls may be muscularly strong, their bones may be weak. Bone mass and strength can begin dissipating in as little as two weeks.

Though living outside 24/7 isn't a necessity to healthy bones, the ability to sprint is. A study of Nielsen's out of Michigan State University involved long yearlings kept on pasture that had normal bone growth. Half the horses were  put in stalls and walked on a walker for an hour every day. The other half remained living outside.

The researchers monitored the horses' bone mass and discovered that horses living in the pastures continued to increase cannon bone mass, but the stalled horses had an immediate drop in bone mass which persisted for the next three months.

The horses then began under-saddle training as 2-year-olds. During their two months of walking, trotting and cantering under saddle, their cannon bones were monitored. The exercise was not enough to cause an increase in stalled horses' bone mass. Bone mass in the stalled horses decreased to the point where it was less than when the study began.

More studies found that sprinting – short, intense running sessions – was key to healthy bone that increased in mass. Horses must have the ability to sprint on their own or while in training, or they will lose bone mass.

Sprinting exerts force on the bone and causes it to bend, encouraging the body to lay down more bone and make the bones stronger. If horses are not allowed to sprint and their bones are prevented from bending, the body will actually take up minerals, believing the bones are strong enough for the work being asked of them.

For horses that are engaged in high-impact activities like racing and jumping, keeping horses in stalls may contribute to injuries as the horses lose bone mass. Additional research shows that adult horses who are stalled also experience bone loss.

Read more at AQHA.

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