TABLE 4.

Mean and median use (mg of active ingredients per kg of liveweight marketed) in 2016 and 2017 across systems using the respective antimicrobials

	2016			2017
Active ingredient	# systems	Mean	Median	# systems	Mean	Median
Amoxicillin	4	4.0	1.9	5	2.2	0.73
Ampicillin	2	0.04	0.04	1	0.006	0.006
Avilamycin	3	0.39	0.04	4	1.76	0.81
Bacitracin	5	50.1	6.6	2	38.2	38.2
Carbadox	6	5.0	2.1	7	3.7	2.3
Ceftiofur	9	0.20	0.06	9	0.15	0.10
Chlortetracycline	9	139.4	73.4	9	70.4	55.1
Enrofloxacin	9	0.29	0.27	9	0.49	0.26
Flavomycin	1	0.014	0.014	0	—	—
Florfenicol	5	0.013	0.007	4	0.07	0.05
Gentamicin	6	0.21	0.20	7	0.12	0.11
Lincomycin	9	42.5	3.8	9	10.1	2.3
Narasin	2	10.7	10.7	1	23.3	23.3
Neomycin	9	5.2	3.8	9	5.9	3.9
Oxytetracycline	7	15.0	4.8	6	21.9	3.8
Penicillin	9	6.6	1.7	9	8.4	2.6
Spectinomycin	2	2.3	2.3	1	0.03	0.03
Sulphadimethoxine	1	0.05	0.05	1	0.86	0.86
Sulphamethazine	1	6.0	6.0	3	3.04	2.97
Sulphmethoxazole	1	0.004	0.004	0	—	—
Tetracycline	3	0.52	0.61	2	0.63	0.63
Tiamulin	9	14.5	8.4	9	8.8	6.0
Tilmicosin	8	1.34	0.74	7	3.6	0.56
Trimethoprim/Sulphadiazine	2	0.76	0.76	5	1.3	0.59
Tulathromycin	7	0.87	0.01	7	0.02	0.002
Tylosin	9	1.89	0.22	8	0.45	0.13
Tylvalosin	6	1.6	1.1	5	1.9	1.8
Virginiamycin	3	6.8	2.8	1	0.0004	0.0004