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Table 8 The quantities of antimicrobials used in sows, suckling pigs, nursery pigs, and grower-finisher pigs by route of administration, including the percentage of herds, number of pigs at risk and the number of pigs exposed (25 sow, 25 nursery, 23 grower-finisher herds, May 2017–April 2018)

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

ROA

Percentage of herds (%)

Pigs at risk

Total kga

Mg/kg biomass

DosesCA/pigb

DoseCA rateb

Sows

Feed

24

781

9332

49.8

6.8

297.6

Injection

84

781

1895

10.1

1.4

61.1

All routes

92

781

11,227

59.9

8.2

358.7

Suckling pigs

Feed

60

9994

1516

37.9

5.8

252.3

Injection

84

9994

843

21.1

5.1

220.6

All routes

92

9994

2359

59.0

10.9

472.9

Nursery pigs

Feed

76

13,251

32,525

213.4

24.1

463.4

Injection

60

13,251

275

1.8

0.2

4.1

Water

40

13,251

9354

61.4

3.6

69.2

All routes

96

13,251

42,155

274.2

27.9

536.8

Grower-finisher pigs

Feed

65

21,638

161,760

115.0

29.8

266.1

Injection

35

21,638

487

0.3

0.04

0.4

Water

13

21,638

20,592

14.6

1.0

8.6

All routes

70

21,638

182,839

130.0

30.8

275.1

  1. ROA route of administration
  2. aTotal kg = the total kilograms of antimicrobial used
  3. bDosesCA per pig = number of Canadian defined daily doses per pig; DoseCA rate = number of Canadian defined daily doses per 1000 pig-days