Author's Organization:Department of Animal Hygine, Faculty of Agriculture, Ibaraki University Department of Animal Hygine, Faculty of Agriculture, Ibaraki University The Institute of Physical and Chemical Research National Institute of Animal Health
Published: December 05, 1983Received: July 11, 1983Available on J-STAGE: February 13, 2008Accepted: September 22, 1983
Advance online publication: -
Revised: -