Table 3.
Temperature, mean temperature–humidity index (THI), and seasons associated with conception rates (CR) of heifers and multiparous cows
| Season | Mean temperature (°C) | Mean THI | Number of animals (N) | CR (%) | ||
|---|---|---|---|---|---|---|
|
|
|
|||||
| Heifers | Multiparous cows | Heifers | Multiparous cows | |||
| Spring (from Mar. to May) | 23.72 | 70.90 | 30 | 95 | 60.73a | 51.25a |
| Summer (from Jun. to Aug.) | 28.63 | 79.75 | 36 | 98 | 56.25a | 42.25b |
| Fall (from Sep. to Nov.) | 25.53 | 74.93 | 25 | 118 | 54.26a | 43.13b |
| Winter (from Dec. to Feb.) | 18.98 | 66.44 | 14 | 126 | 57.41a | 50.66a |
CR: conception rate (pregnancy per artificial insemination service).
a,b
Means with different superscripts in the same row differ at p<0.05.