Diamond V XPC is a proprietary strain of Saccharomyces cerevisiae yeast that can support:
Animal consumption only.
According to the manufacturer, Diamond V:
Growing and mature horses: 14 grams
Foals: 3.5 grams
Draft horses: 28 grams
1 metric volume tablespoon measure contains approximately 12 grams Diamond V XPC.
This will depend on the density, how tightly packed in the spoon.
Mix with feed. Ideally divide amount between meals if feeding more than once per day.