Table 3 Effects of diet form and particle size of corn on apparent total tract digestibility (ATTD) of dry matter (DM) and gross energy (GE) and concentrations of digestible energy (DE), metabolizable energy (ME), and net energy (NE) in diets and total heat production (THP) and fasting heat production (FHP) from group-housed pigs^a (as-is basis)

Intake

 Feed intake, kg/d

2.72

2.62

2.73

2.66

2.61

2.60

0.18

0.254

0.684

0.197

 Orts, kg/d

0.08

0.08

0.09

0.04

0.03

0.04

0.01

< 0.001

0.328

< 0.001

 GE intake, Mcal/d

10.66

10.15

10.69

10.53

10.36

10.28

0.72

0.628

0.693

0.340

Fecal excretion

 Dry feces output, kg/d

0.27

0.23

0.23

0.23

0.20

0.22

0.02

0.001

0.010

0.002

 GE in feces, kcal/kg

4,539

4,568

4,147

4,087

3,988

3,905

61

< 0.001

< 0.001

< 0.001

 Fecal GE output, kcal/d

1,244

1,032

962

924

807

840

60

< 0.001

< 0.001

< 0.001

 ATTD of DM, %

89.87

91.25

91.39

91.38

92.23

91.69

0.38

0.004

0.019

0.019

 ATTD of GE, %

88.26

89.70

90.89

91.08

92.22

91.79

0.45

< 0.001

< 0.001

< 0.001

Urine excretion

 Urine output, kg/d

6.11

5.90

6.81

4.87

5.22

5.68

0.56

0.001

0.034

0.002

 GE in urine, kcal/kg

33.23

33.01

29.19

34.91

35.23

35.05

2.27

0.049

0.318

0.061

 Urine GE output, kcal/d

206

197

194

170

183

194

22

0.075

0.583

0.108

Heat increment^d

 ME intake, kcal/BW^0.6/d

755

725

778

757

763

749

43

0.814

0.727

0.537

 O₂ consumption, L/d

35.64

34.65

34.81

35.74

35.55

35.38

1.90

0.239

0.275

0.530

 CO₂ production, L/d

35.62

35.55

34.87

36.36

35.90

35.96

2.97

0.091

0.266

0.083

 CH₄ production, L/d

-0.05

-0.04

-0.07

-0.06

-0.08

-0.04

0.05

0.479

0.942

0.839

 THP, kcal/d

4,314

4,216

4,218

4,346

4,315

4,299

254

0.166

0.250

0.361

 THP, kcal/BW^0.6/d

358

342

345

350

356

355

23

0.182

0.440

0.759

 FHP, kcal/ BW^0.6/d

212

201

203

207

218

221

16

0.019

0.588

0.196

 Retained energy, kcal/d

4,892

4,710

5,313

5,090

5,053

4,946

477

0.782

0.593

0.744

 Respiratory quotient, fasted

0.65

0.69

0.67

0.69

0.67

0.71

0.04

0.129

0.293

0.022

 Respiratory quotient, fed

1.01

1.03

1.00

1.02

1.03

1.03

0.05

0.469

0.868

0.306

Energy in diets, kcal/kg

 DE

3,459

3,477

3,560

3,599

3,667

3,633

18

< 0.001

< 0.001

< 0.001

 ME

3,385

3,402

3,488

3,535

3,596

3,559

18

< 0.001

< 0.001

< 0.001

 NE

2,735

2,739

2,838

2,857

2,957

2,926

60

< 0.001

0.015

0.004

Energy utilization, %

 ME:DE

97.85

97.87

97.98

98.23

98.06

97.98

0.15

0.045

0.601

0.098

 NE:ME

80.79

80.50

81.35

80.81

82.24

82.19

1.57

0.165

0.200

0.564