[Inhibitory role of the opioid system in the initiation of rumination in sheep].


Major movements of the reticulo-rumen occur approximately once per minute as a result of periodic vagal motor discharges from "gastric centres" located in the medulla oblongata. During rumination evoked by stroking the interior wall of the reticulum or caused by the injection (bolus) of catecholamines, an additional contraction of the reticulum occurs at… (More)


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