Table 1.
Details of management variables relating to 20 conventional and 20 organic dairy herds in which the seroprevalence to BCV and BRSV was studied
| Herd system |
||
|---|---|---|
| Conventional | Organic | |
| Median age in months of cows at sampling (range) | 40 (22–136) | 41 (23–138) |
| Number of herds with/without AIFa | 10/10 | 14/6 |
| Stall type (tied/free) | 13/7 | 6/14 |
| Median number of weeks at pasture (range)b | 17 (0–22) | 20 (8–27) |
| Median herd average milk yieldc (kg/cow/year, range) | 9564 (7804–10,831) | 8383 (5607–11,568) |
| Median herd size (range) | 60 (39–115) | 64 (40–118) |
| Median number of veterinary visits/year (range) | 15 (0–39) | 20 (3–44) |
| Median number of samples/herd (range) | 19 (8–24) | 18 (5–24) |
| Total number of samples (year 2005, 2006) | 358 (169, 189) | 341 (169, 172) |
a
AIF; AI performed by farm personnel rather than by professional AI technicians.
b
Significantly different, Wilcoxon Rank Sum test, P = 0.019.
c
Significantly different, Wilcoxon Rank Sum test, P = 0.003.