Table 5.
Correlation coefficients between performance, ruminating behavior, and methane emission of cows determined in the loose- and tied-housing phases (entire sampling period).
| Trait Housing System | ECM1 (kg·day−1) | Methane2 (g·day−1) | Rumination1 (min·day−1) | Eating1 (min·day−1) |
|---|---|---|---|---|
| DMI (kg·day−1)2 | ||||
| Loose | 0.494 | –0.538 | –0.211 | –0.107 |
| Tied | 0.777** | 0.156 | 0.610* | –0.156 |
| ECM (kg·day−1)1 | ||||
| Loose | –0.387 | 0.143 | 0.397 | |
| Tied | 0.151 | 0.466 | 0.156 | |
| Methane (g·day−1)2 | ||||
| Loose | –0.322 | –0.184 | ||
| Tied | 0.198 | 0.254 | ||
| Rumination (min·day−1)1 | ||||
| Loose | 0.828* | |||
| Tied | –0.296 | |||
** p < 0.01; * p < 0.05. 1 Individual observations in the loose (two treatments × 20 animals) and tied (two treatments × six animals) housing system. 2 Group observations (two treatments × 4 days) in the loose housing and individual observations (two treatments × six animals) in the tied-housing system.