Figure 6
Plasma thyroxine (T4) concentration (ng/mL) for experiment 1 (a) and experiment 2 (b). Incubation temperature was decreased (low: 34.6°C) or increased (high: 40.6°C) from ED 16 to ED 18.5. The control group was incubated at 37.6°C throughout incubation. Different letters (a, b) indicate a significant difference between treatment groups at that time point (P < 0.05); n = 12. Data are expressed as mean ± SEM. ED = embryonic day; IP = internal pipping; EP = external pipping.