Skip to main content

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