Figure 1.

Serum steroid hormone concentrations in placebo and testosterone-treated (test-treated) female pigs. Serum total testosterone (A), serum estradiol (E2) (B), serum progesterone (P4) (C), and testosterone:estradiol (D) in placebo (circles or black bars) and testosterone-treated (squares or gray bars) females over the course of the study. Red arrows indicate the days on which placebo or testosterone was administered intramuscularly. Statistical test used was a repeated-measures ANOVA. We used n = 5 for testosterone-treated females and n = 6 for placebo females for all hormone assessments. *P ≤ 0.05.