Manganese oxide is a general term that refers to a group of compounds composed of oxygen and manganese ions. The most common forms of manganese oxide include manganese dioxide (MnO₂), manganese(III) oxide (Mn₂O₃), and manganese(IV) oxide (MnO₂).

Manganese dioxide is a black, crystalline solid that is widely found in nature as the mineral pyrolusite. It is an important industrial material, used in the production of batteries, ceramics, glass, and fertilizers. Manganese dioxide is also used as a catalyst in the production of chemicals such as formaldehyde and as an oxidizing agent in the manufacture of chemicals such as chlorine dioxide.

Manganese(III) oxide is a brownish-black powder that is used as a pigment in ceramics and glass. It is also used as a catalyst in the production of chemicals and as a component of some types of batteries.

Manganese(IV) oxide, also known as permanganate, is a strong oxidizing agent that is used in a wide range of applications such as water treatment, analytical chemistry, and organic synthesis. It is also used in medicine as an antiseptic, as well as in agriculture as a fungicide.

Manganese oxide (MnO) can be used as a source of manganese in animal feed. Manganese is an essential mineral for animals, and it plays a vital role in many physiological processes, such as the formation of bones, enzymes, and hormones. Deficiencies in manganese can lead to growth retardation, reproductive problems, and other health issues. Manganese oxide (MnO) is used as a source of manganese for all animal species, it is commonly used in poultry feed, swine feed, and ruminant feed. It is particularly beneficial for animals that are growing, reproducing, or lactating, as they have a higher demand for manganese.