|
Itema
|
SCFPb, g/d
|
SEM
|
P-valuec
|
|---|
|
0
|
60
|
120
|
180
|
L
|
Q
|
W
|
T × W
|
|---|
|
DMI, kg/d
|
20.1
|
20.3
|
19.9
|
19.9
|
0.22
|
0.26
|
0.54
|
<0.01
|
0.92
|
|
Milk yield, kg/d
|
22.1
|
21.8
|
22.6
|
22.3
|
0.28
|
0.08
|
0.89
|
<0.01
|
<0.01
|
|
ECM, kg/d
|
25.4
|
25.8
|
26.0
|
25.7
|
0.35
|
0.52
|
0.35
|
<0.01
|
<0.01
|
|
Milk composition, %
|
|
Fat
|
4.35
|
4.41
|
4.35
|
4.36
|
0.075
|
0.95
|
0.81
|
<0.01
|
<0.01
|
|
Protein
|
3.41
|
3.44
|
3.41
|
3.44
|
0.039
|
0.74
|
0.87
|
<0.01
|
<0.01
|
|
Lactose
|
4.78
|
4.79
|
4.73
|
4.75
|
0.036
|
0.33
|
0.87
|
<0.01
|
0.65
|
|
Total solids
|
13.7
|
13.7
|
13.4
|
13.6
|
0.19
|
0.55
|
0.59
|
<0.01
|
0.98
|
|
SCC, ×104
|
57.9
|
35.2
|
46.9
|
47.6
|
11.4
|
0.63
|
0.78
|
0.95
|
0.75
|
|
MUN, mg/dL
|
13.9
|
13.8
|
13.9
|
13.8
|
0.37
|
0.84
|
0.86
|
<0.01
|
0.75
|
|
Initial BW, kg
|
654
|
643
|
670
|
651
|
13.7
|
0.78
|
0.47
| | |
|
BW gain, kg/d
|
0.17
|
0.22
|
0.15
|
0.05
|
0.14
|
0.62
|
0.27
| | |
|
BCS
|
2.98
|
2.77
|
2.99
|
2.80
|
0.10
|
0.47
|
0.94
|
0.04
|
0.20
|
|
Feed efficiency
|
1.28
|
1.28
|
1.32
|
1.28
|
0.025
|
0.17
|
0.50
|
<0.01
|
0.67
|
|
N conversion
|
24.7
|
24.3
|
25.2
|
25.1
|
0.21
|
0.04
|
0.82
|
<0.01
|
0.17
|
-
aDMI = dry matter intake; ECM (energy-corrected milk, kg) = 0.3246 × milk yield (kg) + 13.86 × fat yield (kg) + 7.04 × protein yield (kg) [44]; SCC = somatic cell counts; MUN = milk urea nitrogen; Feed efficiency = kg of ECM/kg of DMI; BCS = body condition score; N conversion = kg of milk protein yield/kg of dietary crude protein intake × 100
-
b
Saccharomyces cerevisiae fermentation product (Diamond V Original XP, Cedar Rapids, Iowa, USA)
-
cT = treatment effect; W = week effect; T × W = interaction between treatment and week; L = linear effect of treatment; Q = quadratic effect of treatment
