American Cyanamid Co.; Withdrawal of Approval of NADA

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The Food and Drug Administration (FDA) is withdrawing approval of a new animal drug application (NADA) held by American Cyanamid Co. The NADA provides for the use of maduramicin ammonium in combination with chlortetracycline in the feed of broiler chickens for prevention of coccidiosis and as an aid in the reduction of mortality due to Escherichia coli infections. The firm requested the withdrawal of the approval of the NADA. In a final rule published elsewhere in this issue of the Federal Register, FDA is amending the regulations by removing the portion of the regulation which reflects approval of the NADA.