Mare Plus keeps mares in top condition right through conception, pregnancy & nursing. Crumbles supply vitamins to supplement those found in regular diet. Feed 1 oz twice daily with the feed. Contains vitamins A, B, D and E, choline, niacin, thiamine, riboflavin, calcium, phosphorus, cobalt, copper, zinc, magnesium, manganese, iodine, iron, potassium and selenium. Feed 1 oz twice daily with the feed. Start feeding to broodmares 90 days before conception and keep feeding it year-round.