There are approximately 11,000 cattle herds in Wales and of the 8,917 herds screened for BVD (approximately 84%), 2,473 (28%) tested positive for the virus.
Mae rhyw 11,000 o fuchesi gwartheg yng Nghymru, ac o'r 8,917 o fuchesi a gafodd eu sgrinio ar gyfer BVD (tua 84%), dangosodd y profion fod 2,473 (28%) yn bositif am y feirws.