Table 2.
Effect of different diets on milk production performance in dairy cows
| Items |
Diets
1
|
P -value | ||
|---|---|---|---|---|
| LCF | HCS | LCS | ||
| Dry matter intake (kg/d) |
20.74 ± 1.87a |
20.33 ± 2.23a |
18.52 ± 0.97b |
0.022 |
| Milk yield (kg/d) |
25.64 ± 4.71A |
21.75 ± 3.89B |
16.84 ± 4.60C |
<0.001 |
| 4% fat corrected milk (kg/d) |
26.27 ± 3.99A |
20.38 ± 3.72B |
16.74 ± 5.00C |
<0.001 |
| Milk fat content (%) |
4.23 ± 0.69a |
3.58 ± 0.42b |
3.95 ± 0.52b |
<0.001 |
| Milk protein content (%) |
3.18 ± 0.19a |
3.07 ± 0.22b |
3.04 ± 0.13b |
0.012 |
| Milk fat yield (kg/d) |
1.07 ± 0.18a |
0.78 ± 0.16b |
0.67 ± 0.22c |
<0.001 |
| Milk protein yield (kg/d) |
0.81 ± 0.13A |
0.66 ± 0.11B |
0.51 ± 0.14C |
<0.001 |
| Milk synthesis efficiency (g/g) |
1.23 ± 0.18a |
1.08 ± 0.16ab |
0.98 ± 0.22b |
0.019 |
| 4% fat corrected milk synthesis efficiency (g/g) |
1.23 ± 0.18a |
1.01 ± 0.14b |
0.95 ± 0.25b |
0.011 |
| Milk fat synthesis efficiency (%) |
4.91 ± 0.97a |
3.83 ± 0.58b |
3.74 ± 1.16b |
0.016 |
| Milk protein synthesis efficiency (%) | 3.86 ± 0.42a | 3.30 ± 0.38ab | 2.94 ± 0.67b | 0.001 |
1LCF is low-concentrate mixed forage diet with a concentrate to roughage ratio of 46 : 54; HCS is high-concentrate corn straw diet with a concentrate to roughage ratio of 65 : 35; LCS is low-concentrate corn straw diet with the same concentrate to roughage ratio (46 : 54) as LCF.
A-CMeans within a row differ (P < 0.01).
a-cMeans within a row differ (P < 0.05).