Table 2.
Comparison of four key performance indicators and the incidences of six common diseases between the intervention and control groups.
| Key performance indicators | Lactation number | Intervention group | Control group | P -value (χ2) |
|---|---|---|---|---|
| Days at first breeding, d | 389–408 | 385–405 | ||
| Pregnant cows at 150 DIM, % | 1 | 86.67% (13/15) | 86.67% (12/15) | >0.05 |
| 2 | 77.77% (7/9) | 76.92% (10/13) | >0.05 | |
| 3 | 57.14% (4/7) | 55.56% (5/9) | >0.05 | |
| 4 | 66.67% (4/6) | 66.67% (4/6) | >0.05 | |
| Total | 75.67% (28/37) | 72.09% (31/43) | >0.05 | |
| Pregnancy loss <90 days of pregnancy, % | 1–2 | 0% (0/24) | 0% (0/28) | >0.05 |
| 3 | 14.29% (1/7) | 22.22% (2/9) | >0.05 | |
| 4 | 16.67% (1/6) | 16.67% (1/6) | >0.05 | |
| Total | 5.41% (2/37) | 6.98% (3/43) | >0.05 | |
| Pregnancy loss > 90 days of pregnancy,% | 1–2, 4 | 0% (0/30) | 0% (0/34) | >0.05 |
| 3 | 0% (0/7) | 11.11% (1/9) | >0.05 | |
| Total | 0% (0/37) | 2.33% (1/43) | >0.05 | |
| Ketosis, % | 1–2 | NAa | NA | |
| 3 | 14.29% (1/7) | 0% (0/9) | >0.05 | |
| 4 | 66.67% (4/6) | 66.67% (4/6) | >0.05 | |
| Total | 38.46% (5/13) | 26.67% (4/15) | >0.05 | |
| Metritis, % | 1–2 | NA | NA | |
| 3 | 0% (0/7) | 0% (0/9) | >0.05 | |
| 4 | 50.00% (3/6) | 83.33% (5/6) | >0.05 | |
| Total | 23.08% (3/13) | 20.00% (5/15) | >0.05 | |
| Retained placenta, % | 1–2 | NA | NA | |
| 3 | 0% (0/7) | 11.11% (1/9) | >0.05 | |
| 4 | 16.67% (1/6) | 0% (0/6) | >0.05 | |
| Total | 7.69% (1/13) | 6.67% (1/15) | >0.05 | |
| Clinical mastitis, % | 1–2 | NA | NA | |
| 3 | 42.86% (3/7) | 33.33% (3/9) | >0.05 | |
| 4 | 33.33% (2/6) | 0% (0/6) | >0.05 | |
| Total | 38.46% (5/13) | 20.00% (3/15) | >0.05 | |
| Lameness, % | 1–2 | NA | NA | |
| 3 | 28.57% (2/7) | 11.11% (1/9) | >0.05 | |
| 4 | 16.67% (1/6) | 50.00% (3/6) | >0.05 | |
| Total | 23.08% (3/13) | 26.67% (4/15) | >0.05 | |
| Enteritis, % | 1–2 | NA | NA | |
| 3 | 28.57% (2/7) | 11.11% (1/9) | >0.05 | |
| 4 | 16.67% (1/6) | 33.33% (2/6) | >0.05 | |
| Total | 23.08% (3/13) | 20.00% (3/15) | >0.05 |
a
Data on the incidence of ketosis, metritis, retained placenta, clinical mastitis, lameness, and enteritis were not available for cows in lactation numbers 1–2.