Table 1.
Descriptive statistics (mean and SD in parentheses) of animal performance and weather variables by lambing season.
| Autumn (17,899 animals) | Winter (24,837 animals) | Spring (8363 animals) | |
|---|---|---|---|
| Test-day milk yield (kg) | 1.52 (0.75) | 1.42 (0.73) | 1.45 (0.77) |
| Lifetime milk yield (kg) | 573.74 (460.39) | 373.17 (269.77) | 225.23 (222.43) |
| Total DIM | 374.88 (254.54) | 260.24 (166.13) | 154.31 (116.45) |
| Total lact | 2.13 (1.33) | 1.68 (0.93) | 1.24 (0.60) |
| Tavg (°C) | 13.44 (8.02) | 19.50 (7.41) | 23.81 (5.57) |
| RHavg (%) | 68.29 (15.61) | 62.42 (14.38) | 59.40 (13.75) |
| THIavg | 13.98 (4.16) | 17.76 (5.59) | 19.63 (3.17) |
Total DIM: Total number of days milked, Total lact: Total number of lactations milked, Tavg: average air temperature, RHavg: average relative humidity, THIavg: average temperature-humidity index.