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Table 5 Effects of prepartum diet on GnRH-induced LH release during early postpartum

From: A prepartum diet supplemented with oilseeds high in oleic or linoleic acid reduced GnRH-induced LH release in dairy cows during second week postpartum

 

Week 1A

Week 2A

P

 

Control

Canola

Sunflower

Control

Canola

Sunflower

TrtB

Trt*wkC

Cows (n)

5

5

5

6

5

5

  

LH Mean (ng/mL)

1.14 ± 0.14

0.84 ± 0.23

0.96 ± 0.21

2.42 ± 0.21¥a

1.66 ± 0.23b

1.83 ± 0.18¥ab

0.03

0.05

LH- Peak (ng/mL) D

2.05 ± 0.75

3.21 ± 0.80

2.19 ± 0.70

5.14 ± 0.80

4.07 ± 0.73

3.72 ± 0.73

0.37

0.11

LH-Peak-time (min) E

32.50 ± 13.26

48.00 ± 13.78

22.50 ± 10.27

81.37 ± 21.53

101.63 ± 21.53

63.37 ± 21.53

0.48

0.74

AUC (ng/mL per 4 h) F

41.52 ± 27.39

84.65 ± 29.26

48.51 ± 25.38

197.26 ± 26.74§c

125.73 ± 26.74§cd

106.99 ± 26.74d

0.26

0.06

Incline rate (ng/mL per min) H

0.09 ± 0.02

0.09 ± 0.02

0.08 ± 0.02

0.06 ± 0.02

0.07 ± 0.02

0.07 ± 0.02

0.98

0.97

  1. a,b: P = 0.02; c,d: P = 0.01
  2. ¥Control tended (P = 0.09) to have greater LH mean concentration than sunflower at wk2. §Control tended (P = 0.08) to have greaterAUC than canola at wk2. AWeek1: First week after calving (n = 5 cows per treatment); Week2: Second week after calving (n = 5 or 6 cows per treatment); BTrt: Dietary treatment; Cwk: Postpartum week; DPeak: The highest concentration of LH after GnRH administration; EPeak-time (min): The interval in minutes from GnRH administration to LH peak; FAUC: Area under curve = 1/2∑Xi-1 (Yi-1 + Yi), where Xi and Yi are sampling time and LH concentration (ng/ml), respectively; HIncline rate = (peak concentration– basal concentration)/Time (min)