# The Poultry Breeding Flocks and Hatcheries (Registration and Testing) Order 1989, Paragraph 1


Blood samples shall be taken, by or under the supervision of an officer of the Minister, from domestic fowls between 3 and 5 weeks before they are transferred to laying accommodation or when they are between 16 and 22 weeks of age, whichever occurs later.

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Source: https://www.legislation.gov.uk/uksi/1989/1963/schedule/4/part/I/paragraph/1 (the official version)
Page: https://openlegislation.uk/poultry-breeding-flocks-and-hatcheries-registration-and-testing-order-1989/schedule-4/part-I/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.