Comparison of blood gas and pH levels in the adrenaline group (n = 7) and in a group of lambs that were delivered vaginally at term (n = 9 animals, with data from ≥ 6 animals in each time bin). Note that Pa,O2 was similar in the two groups from the fourth minute onwards, and that pH was significantly lower in the adrenaline group throughout the 60 min period. *P < 0.05, **P < 0.01, †P < 0.001.