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Halothane caused a global whole-brain metabolic reduction with significant shifts in regional metabolism. Comparisons with previous studies reveal similar absolute and relative metabolic effects for halothane and isoflurane. Propofol, however, was associated with larger absolute metabolic reductions, suppression of relative cortical metabolism more than either inhalational agent, and significantly less suppression of relative basal ganglia and midbrain metabolism.

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The brainstem is the region of the brain of cattle with the highest concentration of the abnormal prion protein associated with bovine spongiform encephalopathy (BSE), and specific nuclei in the medulla oblongata of the brainstem, which exhibit changes as a result of the disease, are involved in the modulation of heart rate variability (HRV). The low- and high-frequency components of the HRV of 48 control cattle, 43 cattle fed 1 g of brain homogenate from BSE field cases and 42 cattle fed 100 g of brain homogenate from BSE field cases were analysed repeatedly for a year. There was a significant difference (P<0.001) between the level of high-frequency HRV observed in the control cattle and in both groups of cattle exposed to BSE. There was also a significant difference (P<0.01) between the low-frequency HRV of the cattle given the high dose and the other two groups.