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Table 2 Influence of dietary treatments on characteristics of digestion

From: Influence of ruminal degradable intake protein restriction on characteristics of digestion and growth performance of feedlot cattle during the late finishing phase

 

Urea fermentation potential

P - value

 

Item

0

0.6

1.2

Linear

Quadratic

SEM

Steer replications

6

6

6

   

Intake (g/d)

 

DM

3556

3553

3551

   

OM

3343

3359

3378

   

NDF

453

455

457

   

N

66.2

57.6

48.2

   

Starch

1907

1919

1932

   

GE (Mcal/d)

15.2

15.2

15.3

   

Flow to the duodenum (g/d)

 

OM

1655

1749

1894

0.05

0.76

83.0

NDF

338

370

456

0.05

0.55

42.0

Starch

385

441

533

0.08

0.77

61.0

Total N

76.4

68.8

64.4

0.04

0.70

4.0

Microbial N

40.6

34.7

31.4

0.04

0.69

3.0

NH-N

2.30

2.04

1.58

0.06

0.72

0.3

Non-ammonia N

74.1

66.7

62.9

0.04

0.66

3.8

Feed N

24.7

23.2

22.7

0.20

0.71

0.9

Ruminal digestibility, %

 

OM

62.6

58.3

53.23

0.04

0.91

0.3

NDF

25.3

18.6

0.30

0.05

0.54

0.9

Starch

79.8

77.0

72.4

0.09

0.78

0.3

Feed N

62.6

59.7

52.9

0.04

0.64

0.5

Microbial efficiency1

19.4

17.8

17.5

0.06

0.40

0.7

N efficiency2

1.12

1.16

1.30

0.05

0.44

0.07

Fecal excretion (g/d)

 

OM

624

705

756

0.06

0.77

48.0

NDF

282

319

348

0.06

0.87

25.0

Starch

35.9

49.0

56.6

0.10

0.78

9.4

Total N

20.9

22.2

21.8

0.48

0.44

1.0

GE (Mcal/d)

3.28

3.66

3.90

0.05

0.75

0.84

Postruminal digestibility (% of flow to duodenum)

 

OM

62.2

59.7

60.0

0.37

0.49

1.9

NDF

15.3

11.2

22.8

0.41

0.33

7.3

Starch

90.5

89.1

89.3

0.60

0.69

1.9

Total N

72.6

67.6

66.2

0.08

0.53

2.7

Total tract digestibility (% of intake)

    

OM

81.3

79.0

77.6

0.06

0.75

1.4

NDF

37.8

29.8

23.9

0.07

0.85

5.3

Starch

98.1

97.4

97.1

0.11

0.77

0.5

Total N

68.5

61.5

54.9

0.04

0.97

4.5

DE, %

78.5

76.0

74.5

0.05

0.74

1.4

DE, Mcal/kg

3.36

3.26

3.20

0.05

0.73

0.06

  1. 1Microbial N, g/kg OM fermented.
  2. 2Nonammonia N flow to the small intestine as a fraction of N intake.