Fig. 1

Growth trajectories of each cross type. The growth period under study started at hatching (ca. 400 °C d) and ended 3 months after the onset of exogeneous feeding (ca. 1100 °C d). PL: PL × PL offspring, SB: SB × SB offspring, F1: first-generation hybrids. Lines: predicted values, bands: 95% confidence intervals