were derived from parent flocks which have been kept in an establishment in which avian influenza surveillance has been carried out with negative results within 21 days prior to the time of collection of eggs from which the day-old chicks were hatched;]
on saatu vanhempaispolvista, jotka on pidetty laitoksessa, jossa on 21 päivän kuluessa ennen niiden munien keräämistä, joista untuvikot on haudottu, toteutettu lintuinfluenssavalvontaa negatiivisin tuloksin;]