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Table 1 Mean ± SEM of oestrous cycle length, interval from onset of standing oestrus to ovulation, P-P4 concentration from onset of oestrus to ovulation, and numbers of artificial inseminations (AIs) in RBH (n = 5) and VH (n = 5).

From: Pregnancy Rates in Repeat-breeder Heifers Following Multiple Artificial Inseminations during Spontaneous Oestrus

Variable RBH VH P Value
Oestrous cycle length (d) 20.8 ± 1.02 21.0 ± 0.84 0.84
Interval from onset of oestrus to ovulation (h) 50.8 ± 5.32 27.6 ± 4.49 <0.05
P-P4 concentrations from onset of oestrus to ovulation (nmol/l) 0.5 ± 0.02 0.2 ± 0.04 <0.001
Total numbers of AIs 8.4 ± 0.93 4.6 ± 0.75 <0.05
  1. P values < 0.05 are considered statistically significant.