Since 2004, cattle numbers have been available from the Cattle Tracing System (CTS) which is managed by the British Cattle Movement Service (BCMS), primarily for animal health purposes.
Ers 2004, mae data am niferoedd gwartheg wedi bod ar gael drwy’r System Olrhain Gwartheg sy’n cael ei rheoli gan Wasanaeth Symud Gwartheg Prydain (BCMS), at ddibenion iechyd anifeiliaid yn bennaf.