the herd register must be completed within 36 hours of a movement, within 7 days of a death and within 30 days of the birth of a calf (7 days of a birth in a dairy herd)
rhaid llenwi’r gofrestr cyn pen 36 awr ar ôl symudiad, cyn pen 7 niwrnod ar ôl marwolaeth a chyn pen 30 diwrnod ar ôl geni llo (7 niwrnod yn achos llo o fuches odro)