Fig. 2. Mean (±SEM) weekly and monthly serum concentrations of immunoreactive relaxin with results of statistical analysis in pregnant bottlenose dolphins with live births (solid line, 34 dolphins and 60 pregnancies) and non-pregnant dolphins
(dashed line, 8 dolphins and corresponding number of estrous cycles). Separate analyses were done for Weeks 0–3 and Months 1–6 relative to estrus or ovulation (Time = 0). Different super-scripts (a, b, c) among means indicate statistical changes (P < 0.05) among months. Values in parentheses on the x-axis represent number of observations used to calculate the means within respective groups.