Hello all. Im concerned with a few of my horses weight. They are on pasture from 8am to 7pm and wormed last month with quest. I cant see ribs but i can feel them. Light bay 14 year old ottb Dark bay 16 year old ottb Paint 21 year old They get tribute senior feed in the pm. Theyve been to the vet to check teeth and vet floated them. But they still dont look right. What do you all add to feed to help gain extra calories? What could be a sudden weight loss like this? The paint has always been a very easy keeper.