Investigation of usefulness of electroreticulograms obtained from the sheep body surface in estimation of reticulum electrical activity.

The experiments were carried out on 3 sheep with one pair of platinum electrodes chronically implanted in the reticulum wall. The reticulum action potentials were recorded simultaneously from the body surface (using the needle electrodes placed subcutaneously) and from the implanted electrodes using an electroencephalograph Reega XVI Duplex TR. It was found that the two- or three-phase deflections on the electroreticulograms obtained from the body surface were exactly correlated with the series of potential spikes on the records from the implanted electrodes.

[Effect of dopamine on cecum motility in sheep].

The influence of dopamine on the motility of the caecum were studied. The experiments were carried out on 4 sheep with chronic fistulas of the caecum. The contractions of the caecum were recorded by the balloon method.

[Effect of dopamine on small-intestinal motility in sheep].

The receptors involved in dopamine effect on the motility of the ileum were studied. The experiments were carried out on 3 sheep with chronic fistulas of the ileum and rumen. The contractions of the fistulated parts of the alimentary tract were recorded by the balloon method.

The phenomenon of reversal of reticulum action potentials recorded from the body surface of sheep.

The experiments were carried out on sheep with reticulum fistula. The biopotentials and transformed mechanogram of the reticulum were recorded simultaneously on the body surface with an electrocardiograph. Lactic acid solution 1.

Participation of the beta-adrenergic receptor in the enteroruminal reflex and enteroenteric reflex.

In sheep with chronic fistulae of the small intestine and rumen the participation of the beta-adrenergic receptor was investigated in the enteroruminal reflex and enteroenteric reflex using the method of pharmacological analysis. The movements of the segments of the digestive tract with fistulae were recorded by the balloon method. A solution of hydrochloric acid administered into the ileum caused a reflex stimulation of its motor activity and inhibited the movements of the rumen.