Skip to main content

Table 4 Concentrations of carnitine in liver biopsy, plasma and milk samples 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

  3 wk prepartum 1 wk postpartum 5 wk postpartum 14 wk postpartum P-value
Liver tissue      
free carnitine, nmol/g wet weight 37.4b ± 4.53 55.6a ± 4.09 26.0c ± 1.76 18.2c ± 1.26 < 0.001
Plasma      
free carnitine, μmol/L 3.82a ± 0.25 1.40c ± 0.10 2.18b ± 0.20 2.35b ± 0.17 < 0.001
carnitine esters*, μmol/L 2.07b ± 0.10 2.54a ± 0.12 2.45ab ± 0.18 1.64c ± 0.11 < 0.001
total carnitine, μmol/L 5.89a ± 0.33 3.94b ± 0.17 4.64b ± 0.32 3.99b ± 0.26 < 0.001
Milk      
free carnitine, μmol/L - 84.5a ± 5.92 50.3b ± 4.34 60.2b ± 2.65 < 0.001
carnitine esters*, μmol/L - 131.1a ± 12.1 65.9b ± 6.23 41.3c ± 2.60 < 0.001
total carnitine, μmol/L - 215.5a ± 16.6 116.2b ± 7.92 101.5b ± 3.93 < 0.001
  1. Values are mean ± SE (n = 20)
  2. a, b, c Means with different superscripts differ significantly (P < 0.05)
  3. *Sum of acetyl- and propionyl carnitine, Sum of free carnitine and carnitine esters