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Table 3 Concentrations and characteristics of FSH, LH, and estradiol-17b after introduction of rams to anestrous ewes primed for 6 days with intravaginal sponges containing 60 mg of MAP. (Abbreviations as in Table 2.) (Experiment 2).

From: Endocrine and Ovarian Changes in Response to the Ram Effect in Medroxyprogesterone Acetate-primed Corriedale Ewes During the Breeding and Nonbreeding Season

  E-O NE-O NE-NO P
LH surge 5/5 5/5 0/4 < 0.001
LH surge concentration (μg/L) 21.3 ± 5.6 11.5 ± 1.9   0.07
Time to LH surge (h) 51.6 ± 8.4 75.6 ± 7.9   0.07
Time to ovulation (h) 67.2 ± 6.1 94.0 ± 8.9   < 0.1
Mean FSH concentration (μg/L) 3.1 ± 0.1 2.7 ± 0.1 2.5 ± 0.4 < 0.1
Maximum FSH concentration (μg/L) 5.1 ± 0.4a 4.3 ± 0.1a 3.4 ± 0.5b < 0.1
Mean estradiol-17β levels (pmol/L) 13.4 ± 1.2 13.3 ± 2.1 10.5 ± 1.3 < 0.1
Maximum estradiol-17β levels (pmol/L) 23.8 ± 3.3 15.8 ± 1.6 17.5 ± 1.9 0.09
  1. Different letters within the same row indicate statistically significant differences.