Figure 1
From: Prostate response to prolactin in sexually active male rats
Serum levels of PRL. The graph represents the comparison of basal values (sine wave) and the values produced after consecutive ejaculations between 12 and 16 hrs (bars). Significant changes are shown just for bars. The white bar is a representative value of the level of PRL obtained before sexual behaviour. Gray bars represent the values obtained after each of the four consecutive ejaculations (mean ± SEM). Asterisks represent significant changes (* = p < 0.05, ** = p < 0.01) in comparison to the paired white bar of each group. The mating-induced PRL is transient and reached higher values after the second ejaculation; ng/ml = nanograms per millilitre.