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Table 3 Performance of dairy cows in the transition period and at different stages of lactation

From: Expression of genes involved in hepatic carnitine synthesis and uptake in dairy cows in the transition period and at different stages of lactation

Variable 3 wk prepartum 1 wk postpartum 5 wk postpartum 14 wk postpartum wks 1 to 14 postpartum P-value
Dry matter intake (kg/d) 13.4c ± 0.33 13.4c ± 0.48 18.4b ± 0.62 20.4a ± 0.53 18.5 ± 0.49 < 0.001
Milk yield (kg/d) - 28.6c ± 0.76 37.5a ± 0.90 32.0b ± 0.81 32.7 ± 0.67 < 0.001
FCM* (kg/d) - 39.2a ± 1.39 40.9a ± 1.51 33.0b ± 1.03 37.7 ± 0.87 < 0.001
Milk fat (%) - 6.40a ± 0.25 4.51b ± 0.20 4.11b ± 0.13 5.00 ± 0.17 < 0.001
Milk protein (%) - 4.09a ± 0.09 2.85c ± 0.05 3.13b ± 0.06 3.35 ± 0.08 < 0.001
Energy balance (MJ NEL/d) 46.9a ± 2.42 -64.9d ± 5.15 -30.4c ± 3.05 3.89b ± 2.11 -12.5 ± 5.52 < 0.001
Energy intake (% of requirement) 215.1 ± 7.92 58.9 ± 2.45 82.3 ± 2.22 102.1 ± 2.10 81.1 ± 2.63 < 0.001
  1. Values are mean ± SE (n = 20)
  2. a, b, c, d Means with different superscripts differ significantly (P < 0.05)
  3. * Corrected for 4% milk fat content
  4. Calculated value
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