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For fetal weights, average placental weight for that gilt was used as a covariate in the analysis. To assess whether treatment effects on uterine capacity were uniformly distributed among conceptuses of different weights, the number of fetuses weighing more than (large) and less than (small) the mean fetal weight of the control group and the number of placentas weighing more than (large) and less than (small) the mean placental weight of the control group were determined for each gilt. The effects of treatments on the number of large and small fetuses and placentas in each litter were then analyzed by ANOVA. To more fully evaluate treatment effects, the following contrasts were used: 1) no-treatment controls versus estradiol valerate treatment (effect of estradiol) and 2) no-treatment controls versus progesterone treatment (effect of progesterone). In experiment 2, pregnancy rates were analyzed using x2 analysis. Gestation length, the number of liveborn and stillborn piglets, and the number of live and dead piglets at weaning for each gilt were analyzed by ANOVA using a model that included the effect of treatment. Piglet weights at birth, weaning, and Day 56 of age were averaged for each litter, and the litter averages were analyzed by ANOVA using a model that included the effect of treatment.