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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)