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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

From: Cortisol levels in skimmed milk during the first 22 weeks of lactation and response to short-term metabolic stress and lameness in dairy cows

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
  1. FR feed restriction, DIM day in milk, day relative to parturition, RSD residual standard deviation, ECM energy corrected milk yield
  2. aResidual standard deviation was calculated by extracting the square root of the residual