Fel rhan o system wyliadwriaeth gynhwysfawr, cynhelir prawf BSE ar bob anifail dros bedair oed sy’n marw ar y fferm.  Er nad yw’r clefyd BSE yn gallu cael ei drosglwyddo o un anifail i’r llall, mae gwartheg eraill, gan gynnwys epil, yn gorfod cael eu holrhain a’u hynysu a byddan nhw’n cael eu difa yn unol â gofynion yr Undeb Ewropeaidd.
All animals over four years of age that die on a farm are routinely tested for the disease under our comprehensive surveillance system. Whilst the disease is not directly transmitted from animal to animal, its cohorts, including offspring, have been traced and isolated, and will be destroyed in line with EU requirements.