Author's Organization:Department of Theriogenology, Faculty of Agriculture, Gifu University Department of Theriogenology, Faculty of Veterinary Medicine, Hokkaido University Department of Theriogenology, Faculty of Veterinary Medicine, Hokkaido University Noboribetsu Bear Park
Published: February 15, 1991Received: March 20, 1990Available on J-STAGE: February 15, 2008Accepted: September 18, 1990
Advance online publication: -
Revised: -