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)
Season | 2013–2014 | 2014–2015 | 2015–2016 | 2016–2017 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Variable (centile) | 10th | 50th | 90th | 10th | 50th | 90th | 10th | 50th | 90th | 10th | 50th | 90th |
Age (years) | 3 | 5 | 8 | 3 | 5 | 8 | 3 | 5 | 8 | 3 | 5 | 8 |
Days in Milk | 215 | 258 | 268 | 219 | 255 | 267 | 221 | 265 | 269 | 218 | 259 | 268 |
Proportion Friesian | 0.50 | 0.75 | 1.00 | 0.50 | 0.75 | 1.00 | 0.50 | 0.75 | 1.00 | 0.5 | 0.75 | 1.0 |
Cows ELISA tested | 1,122 | 1,069 | 1,137 | 1,030 | ||||||||
Number (Proportion) | 95% CI | Number (Proportion) | 95% CI | Number (Proportion) | 95% CI | Number (Proportion) | 95% CI | |||||
ELISA Not Detected | 825 (0.74)a | 0.71–0.76 | 961 (0.90)b | 0.88–0.95 | 1,062 (0.93)c | 0.92–0.95 | 1,006 (0.98)d | 0.97–0.99 | ||||
ELISA Low | 157 (0.14)a | 0.12–0.16 | 39 (0.04)b | 0.03–0.05 | 33 (0.03)b | 0.02–0.04 | 6 (0.01)c | 0.00–0.01 | ||||
ELISA Moderate | 63 (0.06)a | 0.04–0.07 | 27 (0.03)b | 0.02–0.03 | 19 (0.02)b | 0.01–0.03 | 2 (0.00)c | 0.00–0.00 | ||||
ELISA High | 77 (0.07)a | 0.05–0.08 | 42 (0.04)b | 0.03–0.05 | 23 (0.02)c | 0.01–0.03 | 16 (0.02)c | 0.01–0.02 | ||||