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Table 2 Milk solids production, age and days in milk for cows which underwent screening for MAP infection

From: The effect of sub-clinical infection with Mycobacterium avium subsp. paratuberculosis on milk production in a New Zealand dairy herd

Season

2013–14

2014–15

p-value

Variable (Centile)

10th

50th

90th

10th

50th

90th

 

Age (Years)

3

5

8

3

5

8

0.465a

Days in Milk

215

258

268

219

255

267

< 0.001a

Milk Solids (kg/cow)

307

433

552

337

480

590

< 0.001a

ISCC (cells/mL)

31 k

87 k

400 k

25 k

53 k

197 k

< 0.001a

Proportion Friesian

0.50

0.75

1.00

0.50

0.75

1.00

0.860a

Cows in milk

1122

1069

 

ELISA Status

Number (Proportion)

Number (Proportion)

 

 Not Detected

825 (0.74)

961 (0.90)

< 0.001b

 Low

157 (0.14)

39 (0.04)

< 0.001b

 Moderate

63 (0.06)

27 (0.03)

< 0.001b

 High

77 (0.07)

42 (0.04)

0.002b

Total

1122

1069

 

fPCR Status of ELISA positive animals

 Not Detected

235 (0.79)

80(0.74)

0.557b

 Moderate

32 (0.11)

11 (0.10)

0.865b

 High

30 (0.10)

17 (0.16)

0.351b

Total

297

108

 
  1. aWilcoxon Rank Sum
  2. bχ2 test with Holme-Bonferonni correction