Too little Manganese
Manganese (Mn) is important for the utilization of carbohydrates and fats in the body, and for cartilage formation. Manganese deficiency is thought to be connected with poor bone development.
Solutions: Common vitamin/mineral mixtures and commercial concentrates for horses contain manganese. Good quality grass hay is usually a good source for manganese (40 - 140 mg/kg).
Too much Manganese
A surplus of manganese may impair the absorption of iron (and calcium).
Solutions: Reduce amounts of concentrates and mineral mixtures with manganese in ration.