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Table 1 Follicular characteristics and hormonal concentrations during 2-wave and 3-wave interovulatory intervals

From: Ovarian follicular activity and hormonal profile during estrous cycle in cows: the development of 2 versus 3 waves

  No. of follicular waves during an interovulatory interval
  2-wave 3-wave
Interovulatory Intervals   
No. 4 10
Length (days) 19.8 ± 0.6* 22.5 ± 0.8*
Length of days between emergence of waves:   
1st wave to 2nd 8.7 ± 0.3 a 7.2 ± 0.7 a
2nd wave to 3rd 10.8 ± 0.3 b 7.7 ± 0.4 a
3rd wave to ovulation   9.5 ± 0.4 b
Anovulatory follicles   
Maximum diameter (mm) 6.8 ± 0.3* 7.3 ± 0.7*
Ovulatory follicles   
Maximum diameter (mm) 10.9 ± 0.3 11.0 ± 0.9
Estradiol concentration (pg/ml) 5.40 ± 0.26 4.94 ± 0.15
Progesterone concentration (ng/ml) 0.96 ± 0.07* 1.43 ± 0.11*
  1. Values are means ± SEM. Means with (*) in the same row are significantly different (P < 0.05)(LSD). Means with different letters (a,b) in the same column are significantly different (P < 0.05)(LSD).