The Cabinet Secretary said the changes to the specific types of TB test involved have also taken into account the resources required by farmers and vets and cost-effectiveness.
Dywedodd Ysgrifennydd y Cabinet fod y newidiadau i'r mathau penodol o brawf TB dan sylw hefyd wedi ystyried yr adnoddau sydd eu hangen ar ffermwyr a milfeddygon a chost-effeithiolrwydd.