South Australian eggs must now be stamped with the unique identification markings of their producers or processors, providing consumers with a ready means of determining origin and aiding in traceability, according to Agriculture, Food and Fisheries Minister Gail Gago.

All egg producers selling eggs must comply with the new code, which covers eggs and egg products. Those producers with fewer than 50 chickens don't have to be accredited as long as they don't sell their eggs wholesale to food businesses or at farmers' markets. The majority of eggs will be stamped with "SA," followed by a number to identify the farm.

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To gain accreditation, producers will need to contact BiosecuritySA, adopt a food-safety statement, comply with the new standards and pay an annual fee. The fees start at $175 for up to 1,000 hens and rise to $650 for 1,000 to 9,999 hens. Higher charges apply for larger farms.