Table 3. Influence of crating density and weather on respiratory frequency of broilers during transportation.
| Crating density1) | Weather2) | Respiratory frequency (count/min) |
|---|---|---|
| Low | Low | 66.25a |
| Medium | 64.00a | |
| High | 64.50a | |
| Low | High | 158.00b |
| Medium | 162.25bc | |
| High | 178.50c | |
| SEM | 1.515 | |
| Main effect | ||
| Crating density | ||
| Low | 112.13a | |
| Medium | 113.13a | |
| High | 121.50b | |
| SEM | 2.624 | |
| Weather | ||
| Low | 64.92 | |
| High | 166.25 | |
| SEM | 2.142 | |
| p-value | ||
| Crating density | 0.041 | |
| Weather | < 0.001 | |
| Crating density × weather | 0.022 |
1)
Low, 20 birds/crate (0.039 m2/bird); Medium, 25 birds/crate (0.031 m2/bird); High, 30 birds/crate (0.026 m2/bird).
2)
Low, low air temperature (−1°C); High, high air temperature (30°C).
a–c
Values with different superscripts in the same row were significantly different (p < 0.05).