Abstract
Since 2004 Bovine Viral Diarrhea Virus (BVDV) control has been launched in some parts of Hokkaido. As the first pioneer, Yubetsu-town implemented control activities in 2002 and started gathering epidemiological information. In this paper, we set up four scenarios to determine which method (either test-and-slaughter or vaccination) was more effective before heifers’ entering to state breeding farms where most infections occur and quantitatively estimated risk of BVDV infection within the town. As results, it is suggested that at least 25∼26 of 100 farms annually get infected with BVDV without any control measurements. Also vaccination only cannot prevent the infection from spreading. If only one of methods is allowed to use, test-and-slaughter is more effective for reducing risk. Furthermore, as the 5th scenario, we quantified risk of purchasing new animals brought from other towns to a market.
