P-42, r. 1 - Regulation respecting the administering of certain medications

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1.3. The administering of a medication belonging to one of the classes of antimicrobials of the “Category I: Very High Importance” to embryonated poultry eggs is prohibited.
The administering of such medication to embryonated eggs from birds of a flock used to provide genetic material is allowed where the following conditions are present:
(a)  an infectious agent is present within the flock;
(b)  the propagation of the infectious agent to embryonated eggs poses a serious risk to the health of the bird stock or of humans;
(c)  treatment of the infected birds will not control the risk of propagation to embryonated eggs;
(d)  the administering of a medication of a class other than the “Category I: Very High Importance” will not eliminate the infectious agent.
O.C. 1110-2018, s. 1.