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