PROBLEM TO BE SOLVED: To provide a method of manufacturing highly nutritious livestock feed at a low cost and livestock feed by using peel of a citrus such as a mandarin orange or a heavily damaged citrus itself such as a mandarin orange, which has been used as compost or fertilizer, or discarded as it was, as a material.SOLUTION: In a manufacturing method of livestock feed, waste matter of a citrus is contained into a non-permeable bag, for example, and sealed, and is fermented under an anaerobic condition by an action of anaerobic fermenting bacteria attached to the waste matter.
