Author's Organization:National Institute of Animal Health ZEN-NOH Institute of Animal Health National Institute of Animal Health National Institute of Animal Health National Institute of Animal Health National Institute of Animal Health ZEN-NOH Institute of Animal Health National Institute of Animal Health
Published: April 15, 1991Received: July 25, 1990Available on J-STAGE: February 15, 2008Accepted: November 28, 1990
Advance online publication: -
Revised: -