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Table 3 The mean diameter of the dominant follicle at different time interval of insemination

From: Pre-service ultrasonic and manual evaluation of the reproductive organs of dairy cows presumed to be in estrus

Duration to AI after heat detection N Mean (±SD) diameter of dominant follicle [mm] Level of significance
Overall 33 12.7 ± 4.0 P < 0.05
≤6 hrs 12 12.8 ± 3.2
7-14 hrs 7 14.7 ± 1.8
≥15 hrs 13 10.5 ± 5.0