Table 2 Distribution of herd characteristics among respondents and non-respondents
Variable | Category | Respondents (n = 228) | Non-respondents (n = 443) | P-value1 |
|---|---|---|---|---|
Age at 1st calving (days) | 866 (99.1)2 | 898 (115.3) | < 0.01 | |
BMSCC (1000 cells/ml) | 254 (85) | 256 (88) | 0.37 | |
Breed3 | SR | 18.5 | 18.0 | 0.19 |
SH | 20.3 | 26.6 | ||
Mixed | 61.2 | 55.4 | ||
Calving interval (mo) | 13.4 (1.1) | 13.8 (1.3) | < 0.01 | |
Herd size (cow-year) | 94 (107) | 88 (73) | 0.79 | |
Milk yield (kg ECM/ cow-year) | 9264 (1457) | 9191 (1656) | 0.71 | |
Region | North | 20.2 | 22.4 | 0.60 |
Middle | 57.0 | 52.9 | ||
South | 22.8 | 24.7 |