Figure 2. ¹³C enrichment in expired CO₂ of embryos incubated at two different eggshell temperatures (Study II).

¹³C enrichment in expired CO₂, after injecting a single bolus of [U-¹³C]glucose (0.73 mg in 250 µL sterile water) for four consecutive days from day 14.5 of incubation in the chorio-allantoic fluid of embryos incubated at a normal (37.8°C) or high (38.9°C) eggshell temperature (EST) from day 13 of incubation onward.