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Table 4 Results of serological investigations, analyses in faeces (qPCR Lawsonia intracellularis and DM) as well as counts of L. intracellularis and concentrations of short chain fatty acids in caecal content and cecal crypt depth in groups of finishing boars (n = 10/treatment) fed diets with different compositions

From: Experimental studies on effects of diet on Lawsonia intracellularis infections in fattening boars in a natural infection model

Item

Time

Treatment

FP Mean

SD

CM Mean

SD

CORN Mean

SD

WHEY Mean

SD

RPS Mean

SD

  

Blood

PI values blocking ELISA

TP1 (start)

31.0B

12.9

30.5B

16.9

25.5B

13.1

29.0B

14.7

32.9B

14.6

TP6 (final)

53.7A

10.3

50.1A

10.3

57.9A

4.84

57.3A

3.92

58.7A

7.15

Δ TP1 to TP6

22.7

18.9

19.6

23.3

32.4

14.2

28.3

16.2

25.8

17.6

  

Faeces

log10 GE L. intracellularis (per g)

TP1 (start)

2.46AB

2.64

3.58AB

2.54

3.43

2.37

2.30

3.16

2.58B

2.73

TP2 (week 1)

1.08B

2.32

1.54BC

2.48

2.52

2.68

3.75

3.51

1.90B

2.46

TP3 (week 2)

4.32A

3.16

0.59C

1.87

3.06

3.32

4.11

2.99

2.45B

3.33

TP4 (week 3)

3.64AB

3.23

5.83A

2.36

5.06

3.09

5.05

3.28

7.25A

1.44

TP5 (week 4)

4.55A

3.33

4.27A

3.35

4.98

3.42

3.11

3.37

5.46A

3.85

Ø TP2–5 (weeks 1–4)

3.40

3.23

3.03

3.25

3.78

3.19

3.95

3.23

4.08

3.59

∆ (Ø TP2–5−TP1)

0.93

3.14

− 0.57

3.30

0.38

2.65

1.68

3.58

1.51

3.80

DM content (g/kg)

TP1 (start)

237

78.9

247

24.7

254

28.8

248

84.7

240

29.1

TP2 (week 1)

273a

40.9

248bc

10.1

266ab

24.8

241c

19.9

238c

32.1

TP3 (week 2)

259

84.7

238

18.0

257

97.7

245

16.7

214

18.1

TP4 (week 3)

274a

49.2

249ab

24.0

246ab

17.9

241ab

16.8

226b

55.4

TP5 (week 4)

268a

27.4

245ab

17.7

263a

24.6

245ab

17.5

222b

25.9

Ø TP2–5 (weeks 1–4)

269a

53.0

245bc

17.9

258ab

51.16

243bc

17.2

225c

35.4

  

Caecal content or rather caecal wall

log10 GE L. intracellularis (per g)

TP6

4.34ab

3.83

5.46a

3.03

5.16ab

3.63

1.57b

3.32

5.82a

3.51

Starch g/kg DM)

TP6

41.4b

7.97

164a

35.4

136a

40.6

85.1b

22.4

179a

110

Acetate (mmol/kg FM)

TP6

148

6.64

145

8.07

131

14.4

143

6.90

136

27.1

Propionate (mmol/kg FM)

TP6

50.5

3.98

53.8

5.82

51.0

3.03

49.4

2.80

48.6

9.28

Butyrate (mmol/kg FM)

TP6

20.3b

3.32

24.8b

3.83

21.2b

8.38

24.4b

6.09

33.7a

9.53

Crypt depth caecum (μm)

TP6

482b

57.5

473b

50.0

499b

106

475b

66.0

570a

189

  1. Upper case letters (A, B) signify differences in columns (vertical) on the level of a specific feeding group between TPs (between TP1 and TP6 for “PI values blocking ELISA”; between TP1–5 for “log10 GE L. intracellularis”, between TP1–5 for “DM content”) depending on time point at P < 0.05
  2. Lower case letters (a, b, c) signify differences in a row (horizontal) between feeding groups on parameter and TP-level at P < 0.05
  3. FP fine pelleted diet, CM coarse meal diet, CORN meal diet with 22% cracked corn, WHEY meal diet with 16.9% dried whey, RPS meal diet with 30% raw potato starch, Ø abbreviation for mean value, TP1 time point 1 (start); TP2 (week 1), TP3 (week 2), TP4 (week 3), TP5 (week 4), TP6 (slaughter), PI percent inhibition, cut-off values for the blocking ELISA test with a cut-off value of PI 30, GE genome equivalents per gramme faeces, 30 days later