Table 1.
The general characteristics of three Minnesota dairy herds enrolled in a clinical trial for the effect of single cow calving pens (treatment) vs. multiple cow calving pens (control) on the risk of disease in Holstein calves in 2005.
| Herd 1 | Herd 2 | Herd 3 | |
|---|---|---|---|
| Herd size (n) | 580 | 530 | 280 |
| Number of calves enrolled (n) | 229 | 157 | 63 |
| Rolling herd average milk production (kg) | 9,752 | 13,607 | 10,432 |
| Average somatic cell count estimates (per mL) | 230,000 | 180,000 | 230,000 |
| Apparent MAP prevalence estimates (%) | 16 | 10 | 3 |