Hello and welcome.
It may not be related but there has been a scheme running for a good few years, spearheaded by Morrisons and the Duke of Cornwall, to promote the native beef breeds, whereby offspring of a pedigree registered bull of a native breed would attract a premium. So you might find that using a pedigree bull would be sufficient; make sure his details are on the passport of all the calves he sires when you register them.