PROBLEM TO BE SOLVED: To provide a bedding for a livestock excellent in antibacterial activity to bacterium such as Escherichia coli and antiviral activity, capable of improving remarkably decline of fattening efficiency caused by a disease of especially a young livestock such as a piglet.SOLUTION: A composition containing (A) a volcanic ejecta foam and (B) an inorganic alkaline material so that the weight ratio ([A]:[B]) between (A) and (B) becomes 1:0.01-1:0.5 is used as a bedding for a livestock.SELECTED DRAWING: None