Author's Organization:College of Agriculture alrd Veterilaary Medicine, Nihon University College of Agriculture alrd Veterilaary Medicine, Nihon University College of Agriculture, University of the Ryukyus
Published: December 01, 1992Received: April 17, 1992Available on J-STAGE: April 18, 2008Accepted: September 07, 1992
Advance online publication: -
Revised: -