Table 1.

Example calculation of the mean daily dose and the Canadian defined daily dose for animals (DDDvetCA) for selected antimicrobial active ingredients and routes of administration, in poultry and pigs.

Species	Antimicrobial active ingredient	ROA a	Number of products marketed in Canadab	Unique dosages	Mean daily dose	Feed or water WCRc,d	DDDvetCA (mg/kg BW/day)e
Pigs	Chlortetracycline	Feed	12	55, 110, 220, 656	260.3 mg/kg feed	0.04	10.4
	Tylosin	Injectable	1	5.5	5.5 mg/kg bodyweight	N/Af	5.5
	Tylosin	Water	2	83, 250	166.5 mg/L water	0.1	16.7
Poultry	Bacitracin	Feed	3	55, 82.5, 110	77.9 mg/kg feed	0.13	10.1
	Amoxicillin	Water	2	52	52.0 mg/L water	0.23	12.0

^aRoute of administration.

^bCanadian Animal Health Institute (16).

^cWCR, weight conversion ratio in kg feed/kg animal or L water/kg animal.

^dEuropean Medicines Agency (9).

^eBW, body weight.

^fNot applicable.