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Table 1 Number of untreated (−) and antibiotics (AB) treated (+) pigs per risk factor, presented at 2, 4 and 12 weeks of age. Missing, dead and pigs never receiving a raised without antibiotics (RWA) ear-tag are excluded from this table

From: Performance and risk factors associated with first antibiotic treatment in two herds, raising pigs without antibiotics

 

Herd A

Herd B

2 weeks

4 weeks

12 weeks

2 weeks

4 weeks

12 weeks

AB treated

All

+

All

+

All

+

All

+

All

+

All

+

Gender

NS

  

NS

  

NS

  

**

  

**

  

NS

  

 Female

233

207

26

234

191

43

212

178

34

170

167

3

168

163

5

158

146

12

 Barrow

230

207

23

223

180

43

203

155

48

182

167

15

181

163

18

171

152

19

IUGRa at birth

NS

  

NS

  

NS

  

NS

  

NS

  

NS

  

 Yes

26

22

4

27

21

6

23

20

3

18

17

1

18

17

1

16

15

1

 No

437

392

45

430

350

80

392

313

79

334

317

17

331

309

22

313

283

30

BiWa

NS

  

*

  

NS

  

NS

  

NS

  

NS

  

  < 1 kg

95

83

12

93

68

25

79

59

20

38

35

3

38

34

4

36

32

4

 1–1.6 kg

296

267

29

290

241

49

264

214

50

241

232

9

239

227

12

225

206

19

  > 1.6 kg

63

56

7

62

54

8

62

53

9

66

60

6

65

58

7

61

53

8

BWa 2 weeks

**

  

**

  

**

  

NS

  

NS

  

NS

  

  < 2.7 kg

54

39

15

50

29

21

38

25

13

69

65

4

68

62

6

65

57

8

 2.7–4.5 kg

314

278

36

300

249

51

277

221

56

207

196

11

206

192

14

190

172

18

  >  4.5 kg

97

92

5

96

87

9

92

82

9

55

53

2

54

53

1

53

51

2

BW 4 weeks

   

**

  

**

     

NS

  

NS

  

  <  4.5 kg

62

31

31

55

22

33

24

21

3

22

17

5

 4.5–7.2 kg

265

225

40

241

202

39

270

253

17

255

234

21

  >  7.2 kg

82

77

5

79

74

5

39

38

1

37

34

3

BW 12 weeks

      

**

        

NS

  

  < 23 kg

54

33

21

 

58

50

8

 23–36 kg

248

202

46

 

227

207

20

  > 36 kg

104

93

11

 

38

35

3

Sow parity

NS

  

NS

  

NS

  

*

  

*

  

NS

  

 1

50

43

7

48

38

10

44

34

10

41

35

6

40

34

6

37

30

7

  > 1

413

371

42

406

332

74

368

298

70

311

299

12

309

292

17

292

268

24

Total born piglets (sow)

NS

  

NS

  

NS

  

**

  

*

  

*

  

  <  19

70

62

8

69

57

12

65

52

13

22

17

5

21

16

5

20

15

5

 19–25

232

213

19

229

194

35

211

177

34

234

226

8

233

222

11

224

210

14

  >  25

99

83

16

97

71

26

83

62

21

81

78

3

80

76

4

71

62

9

Transfers between sows

   

NS

        

NS

     

 0

184

151

33

21

20

1

 1

265

214

51

101

92

9

 2

8

6

2

175

163

12

 3

44

44

0

 4

8

7

1

Transfers in weaner unit

    

*

        

NS

  

 0

246

208

38

92

83

9

 1

90

71

19

66

58

8

 2

67

44

23

130

120

10

 3

12

10

2

36

32

4

 4

 

5

5

0

  1. aIUGR intra-uterine growth restricted, BiW birthweight, BW bodyweight
  2. NS non-significant, * P < 0.05, ** P < 0.01. Logistic model and P-values association tested by Chi square-test