# The Poultry Breeding Flocks and Hatcheries (Registration and Testing) Order 1989, Paragraph 2


The number of birds from which blood samples shall be taken shall be as follows–
(a) in the case of birds at grandparent level and above, all birds; and
(b) in the case of birds at parent level, a number calculated in accordance with the following table–
Number of birds at parent level required to be sampled for testing for Salmonella pullorum
Number of birds kept in a house or, on premises on which birds have free access to more than one house, number of birds in each group of houses on such premises
Number of birds to be sampled in that house or in that group of houses on those premises
300 or less
All birds up to 150
301–400
160
401–4000
170
4001 or more
180

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Source: https://www.legislation.gov.uk/uksi/1989/1963/schedule/4/part/I/paragraph/2 (the official version)
Page: https://openlegislation.uk/poultry-breeding-flocks-and-hatcheries-registration-and-testing-order-1989/schedule-4/part-I/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.