Testicular growth in neonatal rats.

<p>Male rats were weighted and sacrificed at the ages of 3, 5, 7, 9, 11 and 14 days. Testes were dissected and weighted. Data represent mean ± SEM of 6–8 individual animals. Regression lines for testis weights (TW): {[TW (days 3–9, mg)] = 0.043+2.923 [Day]} and {[TW (days 9–14, mg)] = −40.782+7.407 [Day]}. The difference between linear slope coefficients modeling the rate of change in testes weight before (b1 = 2.923±0.062, n = 4) and after day 9 (b2 = 7.40716±0.299, n = 3) was significant (p<0.001). All means were significantly different (p<0.05) from younger and older groups except the mean body weight of 11-day-old pups (#) that did not differ from the 9-day-old group as analyzed by one-way ANOVA followed by Tukey's post hoc test.