Abstract
The electrical activities in abomasum were studied on the normal and left abomasal displaced cows. Electromyograms were obtained using eight bipolar-needle electrodes fixed by suture in the serosal surface of the various portions of the abomasum; one in the cardia, three in the fundus, and four in the pylorus. The results were summarized as follows: 1. In the cardia and fundus, the repetetive but irregular spikeburst was observed. 2. In the pylorus, the single spike followed by the spikeburst was observed. These spikes were rhythmic and propagative. The propagation velocity in the pylorus was shown the tendency to increase with approach to the pyloric canall. The electomyographic pattern in the cows was similar to goats except the discharge interval was longer in cattles than in goats. 3. The electrical activities in the abomasum received the left abomasal displacement showed the higher amplitude, the more prolonged discharge interval and accerelated propagation velocity than in controls.
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