Fig. 2

Plots representing the mean ± standard deviation (SD) of the bispectral index pre-stimulus (BISpre, above, 0–100), the bispectral index post-stimulus (BISpost, middle, 0–100), their difference (BISdiff, below, 0–50) and the at the different minimum anaesthetic concentrations (MAC) multiples, from 1.75 to 0.75, and after extubation (ext.) in chickens (n = 10) under isoflurane and sevoflurane anaesthesia with either of NaCl solution (0.25 ml/kg, control, white), butorphanol (1 mg/kg, grey) or medetomidine (0.1 mg/kg, black). Data obtained by repeated measurements in each individual