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 | Â | Â |
BW gain, kg/d | 0.17 | 0.22 | 0.15 | 0.05 | 0.14 | 0.62 | 0.27 | Â | Â |
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 |