Figure 1From: Pregnancy Rates in Repeat-breeder Heifers Following Multiple Artificial Inseminations during Spontaneous OestrusPlasma-progesterone concentrations (mean ± SEM) in RBH (n = 5; solid line) and VH (n = 5; dotted line) from 3 days before onset of oestrus (day 0), during the interval from onset of oestrus to ovulation, and on the following Days 3 and 6 of the cycle.Back to article page