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Table 1 Median, 10th and 90th centile of milk solids production, age and days in milk for cows from a NZ, pastoral dairy farm which underwent annual screening for infection with MAP. Infection status was assessed using whole herd serum ELISA. ELISA results were classified as Not Detected (< 50 ELISA units (EU)), Low (50–100 EU), Moderate (101–150 EU) or High (> 150 EU). Results are presented as numerical count and proportions together with 95% confidence intervals. Results with differing superscripts are statistically different (p <  0.05)

From: Control of Mycobacterium avium subsp. paratuberculosis infection on a New Zealand pastoral dairy farm

Season2013–20142014–20152015–20162016–2017
Variable (centile)10th50th90th10th50th90th10th50th90th10th50th90th
Age (years)358358358358
Days in Milk215258268219255267221265269218259268
Proportion Friesian0.500.751.000.500.751.000.500.751.000.50.751.0
Cows ELISA tested1,1221,0691,1371,030
 Number
(Proportion)
95% CINumber
(Proportion)
95% CINumber
(Proportion)
95% CINumber
(Proportion)
95% CI
ELISA Not Detected825 (0.74)a0.71–0.76961 (0.90)b0.88–0.951,062 (0.93)c0.92–0.951,006 (0.98)d0.97–0.99
ELISA Low157 (0.14)a0.12–0.1639 (0.04)b0.03–0.0533 (0.03)b0.02–0.046 (0.01)c0.00–0.01
ELISA Moderate63 (0.06)a0.04–0.0727 (0.03)b0.02–0.0319 (0.02)b0.01–0.032 (0.00)c0.00–0.00
ELISA High77 (0.07)a0.05–0.0842 (0.04)b0.03–0.0523 (0.02)c0.01–0.0316 (0.02)c0.01–0.02