Hi Diane,

Certainly genetics can play a significant role in many, if not most, disorders. However, over the past few years there has been research to suggest that high starch diets -- those from cereal grains such as oats, corn, and barley -- can cause osteopathic disorders in growning horses.

And, the second consideration is that most growing horses are not worked, so they simply do not need the extra calories. Too many calories can lead to too fast a growth rate.

The best way to feed a growing horse is to provide all the grass hay he wants, along with approximately 20 to 30% of the hay ration as alfalfa. Have the hay analyzed to ensure enough lysine intake. Otherwise supplement Lysine to bring the level to at least 44 grams per day. This essential amino acid is necessary for proper tissue development. And, finally, fill in the nutritional gaps with a good vitamin/mineral supplement designed for growing horses.

If you feed a complete feed, as you mentioned, be sure it does not contain cereal grains and has at least 18% fiber. But, again, your filly may not require the additional calories. And, to get all the vitamin and mineral fortification, you would have to feed it according to directions. Using it, instead, as a "carrier" for supplements by feeding a small amount, would work nicely.

Thank you for writing about this very important topic.

All the best,

Dr. Getty

Where are you from? Bayfield, CO