Abstract

Cerebrospinal fluid (CSF) was collected from the lateral ventricles of either 24-hr fasted or “satiated” sheep (donors) and injected into the lateral or third ventricle of either 24-hr fasted or “satiated” sheep (recipients). Recipient “satiated” sheep ate more following injections of CSF from fasted donors, as compared to when the same animals were injected with CSF from equally “satiated” donors (e.g., 73±10 vs 16±6g respectively, 15 min post-injection, P <0.01). Feed intake of fasted recipient sheep was slightly depressed following intraventricular injections of CSF from “satiated” donors. Apparently, the composition of cerebrospinal fluid of the donor sheep was affected by the surfeit-deficit state of their energy stores.

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