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21.—(1) The Scottish Ministers must (subject to paragraph (2)) endeavour to trace from infected premises–
(a)the meat of all poultry slaughtered during the unregulated period of infection;
(b)poultry eggs laid at the premises during that period; and
(c)poultry hatched from such eggs.
(2) The Scottish Ministers need not trace poultry meat or eggs moved from retail premises.
(3) In this article and in article 50, “unregulated period of infection” means the period from the date when, in the opinion of the Chief Veterinary Officer (Scotland), avian influenza may first have been introduced to premises to the date when restrictions were imposed in relation to the premises under article 10.