Table 1.
Summary data describing animal and diet characteristics (n = 987 observations).
| Item | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|
| Animal and diet data | ||||
| Live weight, kg | 539 | 92 | 143 | 757 |
| Milk yield. kg/d1 | 22.0 | 7.9 | 3.8 | 49.1 |
| Dry matter intake, kg/d | 14.8 | 4.9 | 3.3 | 26.1 |
| Forage proportion, kg/kg DM | 0.59 | 0.24 | 0.10 | 1.00 |
| Acid detergent fibre, kg/kg DM | 0.24 | 0.05 | 0.16 | 0.39 |
| Neutral detergent fibre, kg/kg DM | 0.42 | 0.07 | 0.27 | 0.61 |
| Metabolisable energy, MJ/kg DM | 11.9 | 1.13 | 7.61 | 15.3 |
| Gas production per animal | ||||
| CH4, L/d | 467 | 141 | 98 | 793 |
| CO2, L/d | 5,558 | 1,419 | 1,716 | 9,233 |
| O2, L/d | 5,544 | 1,320 | 1,615 | 9,036 |
| Respiratory quotient | 1.00 | 0.09 | 0.60 | 1.28 |
| CH4:CO2, L/L | 0.083 | 0.011 | 0.054 | 0.110 |
SD = standard deviation.
1
Milk yield for lactating cows only (data were available for n = 408 animals).