Table 1.
Mean cortisol in skimmed milk (LSM) at three days before, three days of and three days after feed restriction (70 % of previous ad libitum intake) in early and mid-lactation
| Relative to FR | FR in early lactation (n = 24) | FR in mid-lactation (n = 22) | RSDa | ||
|---|---|---|---|---|---|
| DIM | Cortisol, nmol/L | DIM | Cortisol, nmol/L | ||
| Before | 23 | 4.67 | 138 | 5.17 | 1.86 |
| 24 | 3.85 | 139 | 4.74 | ||
| 25 | 4.24 | 140 | 4.76 | ||
| During | 26 | 4.14 | 141 | 4.55 | |
| 27 | 3.88 | 142 | 3.70 | ||
| 28 | 4.51 | 143 | 3.91 | ||
| After | 29 | 4.25 | 144 | 3.76 | |
| 30 | 4.68 | 145 | 4.96 | ||
| 31 | 4.38 | 146 | 5.09 | ||
FR feed restriction, DIM day in milk, day relative to parturition, RSD residual standard deviation, ECM energy corrected milk yield
aResidual standard deviation was calculated by extracting the square root of the residual