Because Farming is one of the most over regulated bussiness in the country
remove the animal six day movement ban as it restricts farming business (and is still enforced from 2001 foot & mouth outbreak) It is of no benefit to disease control and is costly to both farming and Trading standards council enforcement officers.
A better way of dealing with this would be to extend the Minimum Value rules to all livestock and ensure that animals are vaccinated in the first place.