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Context: I wneud cais am basbort gwartheg mae angen y canlynol arnoch: dyddiad geni; brîd; rhif tag clust (nod y fuches, digid gwirio a rhif yr anifail); rhyw; rhif tag clust y fam eni; rhif tag clust genetig y fam (os yw'n wahanol i rif y fam eni); rhif tag clust y tad (os yw'n hysbys).
