| − | Manganese does not occur naturally as a free element, but is often found in combination with [[Iron - Nutrition|iron]] and in many minerals. It is one of a group of metals or minerals that are [[Nutrition Glossary#Essential Nutrients|'''essential nutrients''']] in dogs and cats. It only occurs in very small amounts in animal tissues; it is referred to as a '''trace element''' because the requirement for this mineral is relatively small. | + | Manganese does not occur naturally as a free element, but is often found in combination with [[Iron - Nutrition|iron]] and in many [[Minerals - Nutrition|minerals]]. It is one of a group of metals or minerals that are [[Nutrition Glossary#Essential Nutrients|'''essential nutrients''']] in dogs and cats. It only occurs in very small amounts in animal tissues; it is referred to as a '''trace element''' because the requirement for this mineral is relatively small. |