Antimicrobial use in lactating sows, piglets, nursery, and grower-finisher pigs on swine farms in Ontario, Canada during 2017 and 2018

Table 10 The quantities of antimicrobial active ingredients used in creep feed for suckling pigs as measured in weight-based and dose-based metrics (25 sow herds in the province of Ontario, Canada, May 2017–April 2018)

ROA	Antimicrobial active ingredient	Class	Number of herds	Mg/kg biomass	Doses_CA/pig^a	Dose_CA rate^a
Feed	Chlortetracycline	Tetracyclines	14	27.8	2.67	116.1
	Procaine penicillin G	Penicillins	2	0.5	0.04	1.7
	Salinomycin	Ionophores	1	1.3	1.30	56.4
	Sulfamethazine	Sulfonamides	2	1.0	0.24	10.4
	Tiamulin	Pleuromutilins	12	5.3	0.95	41.2
	Tylosin	Macrolides	1	1.9	0.61	26.6
Injection	Benzathine penicillin G (with other antimicrobials)	Penicillins	3	2.57	2.14	93.08
	Ceftiofur	Cephalosporins	2	0.13	0.04	1.92
	Ceftiofur LA	Cephalosporins	4	0.77	0.77	33.50
	Enrofloxacin	Fluoroquinolones	2	0.10	0.01	0.57
	Gentamicin	Aminoglycosides	1	0.02	0.01	0.58
	Procaine penicillin G	Penicillins	11	4.21	0.31	13.56
	Procaine penicillin G LA	Penicillins	3	1.68	0.25	10.87
	Sulfadoxine (with trimethoprim)	Sulfonamides	10	6.97	0.28	12.13
	Trimethoprim (with sulfadoxine)	Dihydrofolate reductase inhibitors	10	1.39	0.28	12.13
	Tulathromycin	Macrolides	1	0.12	0.40	17.51
	Tylosin	Macrolides	3	3.12	0.57	24.71

ROA route of administration
^aDoses_CA per pig = number of Canadian defined daily doses per pig; Dose_CA rate = number of Canadian defined daily doses per 1000 pig-days

ISSN: 2055-5660