Because we don't know the whole story, it's best to raise these specific types of questions with your veterinarian. . . Yes, I understand, and she is on line right now. Analyze it for insulin. I'd probably radiograph for OCD lesions when the foal is 8 to 9 months old. We're 30 minutes into our chat this evening, which is a good time to switch gears to . . .
Renal disease is one where diet is especially important.
The kidneys are a key point of excess calcium excretion. If renal function is impaired it is imperative to avoid high calcium feeds such as alfalfa, clover, calcium fortified rice brans, etc. Even beet pulp can be a problem. The liver is the main site of glucose regulation and high starch feeds are helpful in maintaining blood glucose. It is also the site of vitamin C and niacin synthesis as well as vitamin A storage, so supplementing these vitamins may be useful.