| 摘要 |
In one aspect, the present invention is directed to a method of protecting a poultry bird against coccidiosis. The method comprises: a) administering to the bird a live vaccine containing sufficient number of Eimeria sp. to develop an immunological response in the animal; b) maintaining the animal free from chemotherapeutic agents effective against the Eimeria sp. for a period of time corresponding to about one life cycle or infectious cycle of the Eimeria sp.; and c) thereafter administering to the animal a therapeutic amount of a narasin ionophore for a period of time corresponding to at least one life cycle or infectious cycle of the Eimeria sp.
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