Table 3.
Barn temperature, relative humidity, and temperature-humidity index (THI) for steers fed endophyte-free (E−) or endophyte-infected (E+) fescue seed above (Experiment 1) or within (Experiment 2) their thermoneutral zone.
| Item | Experiment 1 | Experiment 2 | ||||||
|---|---|---|---|---|---|---|---|---|
| Period 1 | Period 2 | Period 1 | Period 2 | |||||
| Mean | STD | Mean | STD | Mean | STD | Mean | STD | |
| TEMPERATURE, °C | ||||||||
| Minimuma | 23.2 | 1.2 | 24.0 | 1.2 | 11.9 | 1.9 | 11.9 | 2.3 |
| Maximuma | 32.4 | 0.8 | 32.2 | 1.9 | 17.4 | 4.1 | 17.4 | 2.8 |
| 1200a | 30.3 | 1.3 | 30.0 | 2.7 | 15.8 | 4.0 | 15.6 | 2.8 |
| Sampling daysb | ||||||||
| 0730 | 24.5 | 1.3 | 24.3 | 0.8 | 12.2 | 2.1 | 12.5 | 1.9 |
| 1230 | 30.9 | 1.1 | 29.1 | 2.8 | 15.5 | 3.6 | 15.4 | 3.2 |
| 1530 | 30.6 | 2.0 | 30.1 | 1.7 | 16.2 | 4.0 | 16.4 | 3.5 |
| RELATIVE HUMIDITY, % | ||||||||
| Minimuma | 46.5 | 10.7 | 50.5 | 10.9 | 46.6 | 10.7 | 53.3 | 13.3 |
| Maximuma | 81.3 | 6.7 | 86.2 | 6.9 | 77.9 | 7.3 | 83.1 | 10.6 |
| 1200a | 58.3 | 10.2 | 64.1 | 14.7 | 57.3 | 13.2 | 64.6 | 13.9 |
| Sampling daysb | ||||||||
| 0730 | 74.6 | 7.7 | 79.8 | 8.6 | 62.9 | 7.2 | 64.5 | 13.7 |
| 1230 | 57.4 | 10.1 | 65.1 | 16.0 | 54.3 | 8.8 | 58.8 | 11.3 |
| 1530 | 56.5 | 15.2 | 57.6 | 14.5 | 46.7 | 7.7 | 54.2 | 11.8 |
| THIc | ||||||||
| Minimuma | 69.0 | 2.0 | 70.3 | 1.7 | 54.7 | 2.5 | 54.8 | 2.9 |
| Maximuma | 86.9 | 1.6 | 87.4 | 2.7 | 62.7 | 6.6 | 63.0 | 4.7 |
| 1200a | 79.9 | 2.2 | 80.1 | 2.5 | 59.7 | 5.5 | 59.8 | 4.2 |
| Sampling daysb | ||||||||
| 0730 | 73.5 | 2.4 | 73.7 | 1.6 | 54.7 | 3.0 | 55.2 | 2.7 |
| 1230 | 80.2 | 2.6 | 78.9 | 3.1 | 59.3 | 4.8 | 59.3 | 4.7 |
| 1530 | 79.5 | 1.9 | 79.3 | 2.0 | 60.0 | 4.9 | 60.8 | 5.0 |
a
Data from the last 16 d of each period.
b
d 20, 25, 29, and 35 of each period.
c
THI = 0.8Ta + [(0.01 RH × (Ta−14.3)] + 46.3 where Ta = ambient temperature, °C (Mader et al., 2002).