Motor activity of the abomasum in sheep.

The experiments were carried out on 5 sheep with chronic fistulae of the rumen and of the fundus and pyloric part of the abomasum. The motor activity of the parts of the stomach containing fistulae was recorded by the balloon method. The analysis of the obtained contraction curves showed that the motor activity of the pyloric part was more intense than that of the fundus of the abomasum, and the intensity increased with filling of the multichamber stomach with food, food intake increased the tonus and the intensity of peristaltic movements in the fundus and pyloric part of the abomasum, rumination had no effect on the motor activity of the fundus but increased usually the frequency of contractions of the pyloric part. It has been demonstrated also that the movements of the pyloric part of the abomasum can be inhibited for short time periods.