Table 2 Descriptive analysis of animal performance, gas exchange measurements and computed heat production (n = 168)

 BW, kg

500

915

692

680

80

 mBW^a, kg^0.75

105.7

166.4

134.8

133.3

11.7

 Lactation number

1.0

10

2.9

3.0

1.6

 Days in milk, d

42.0

423.0

213.5

259.0

92.8

 DMI, kg/d

4.6

27.9

17.7

17.8

3.4

 Milk yield, L/d

5.2

51.4

25.7

24.0

10.3

 O₂, L

4686

9238

6786

6740

720

 CO₂, L

4615

9313

7072

7099

908

 CH₄, L

299

792

570

579

81

 Heat production, kJ/kg BW^0.75

712

1469

1067

1068

136