All livestock in Wales, are required to be uniquely identified with official ear tags (except pigs) and have their movements accurately recorded and traced throughout their lives.
Rhaid rhoi tag clust swyddogol â rhif unigryw arno ar holl dda byw Cymru (ac eithrio moch) a rhaid cofnodi'u symudiadau a'u holrhain yn gywir drwy gydol eu bywydau.