Table 2.
Item | Treatment (T) | P-value | ||||
---|---|---|---|---|---|---|
HS | CL | SE | T | Week (W) | T × W | |
N | 23 | 23 | — | — | — | — |
Rectal temperature, °C | 39.8 | 39.1 | 0.17 | 0.04 | 0.78 | 0.73 |
DMI, kg/d | 19.8 | 21.3 | 0.26 | <0.001 | 0.07 | 0.03 |
NEL intake, Mcal/d | 32.4 | 35.0 | 0.43 | <0.001 | 0.07 | 0.03 |
Yields of milk and milk composition, kg/d | ||||||
Whole lactation milk, kg | 9,173 | 10,615 | 172 | <0.001 | — | — |
Raw milk | 31.2 | 38.6 | 1.28 | <0.001 | <0.001 | 0.04 |
FPCM1 | 32.1 | 35.7 | 1.18 | 0.03 | <0.001 | 0.02 |
Fat | 1.26 | 1.43 | 0.04 | 0.01 | 0.009 | 0.01 |
Protein | 0.99 | 1.16 | 0.04 | 0.006 | <0.001 | 0.14 |
Lactose | 1.44 | 1.76 | 0.05 | <0.001 | <0.001 | 0.01 |
SNF | 2.63 | 3.19 | 0.11 | 0.001 | <0.001 | 0.03 |
Milk composition, % | ||||||
Fat | 4.31 | 3.59 | 0.04 | <0.001 | <0.001 | <0.001 |
Protein | 3.25 | 3.06 | 0.02 | <0.001 | <0.001 | 0.70 |
Lactose | 4.73 | 4.58 | 0.02 | <0.001 | 0.001 | <0.001 |
SNF | 8.63 | 8.38 | 0.04 | <0.001 | 0.05 | <0.001 |
SCS2 | 3.49 | 2.13 | 0.06 | <0.001 | <0.001 | 0.003 |
Feed efficiency | ||||||
Raw milk/DMI | 1.58 | 1.81 | 0.03 | 0.002 | 0.001 | 0.31 |
FPCM/DMI | 1.62 | 1.68 | 0.04 | 0.16 | 0.09 | 0.25 |
Tissue gain | ||||||
BCS | 2.36 | 2.62 | 0.09 | 0.06 | <0.001 | 0.04 |
1FPCM yield = fat- and protein-corrected milk [(0.337 + 0.116 × fat % + 0.06 × protein %) × milk yield (kg/d)] (Heuer, 2004; Kargar et al., 2014).
2Somatic cell score = [log10(SCC/12.5)]/log10(2) (Karimi et al., 2015).