Time to event curves representing the proportion of subject females that have yet to successfully reproduce relative to the day the first male was introduced for mating (Cox proportional hazard, p=0.164). Gray line represents the treatment group, black line represents control group. Inset graph, demonstrates the number of first pregnancies that failed due to miscarriages or dead pups, (n=19 first pregnancies in each group) (Fisher’s exact test, p=0.099).