Influence of the experimental rumen acidosis on the myoelectrical activity of uterine muscles in ewes.

摘要

The aim of this study was to investigate the influence of rumen acidosis on the myoelectrical activity of uterine muscles in ewes. The experiment was carried out on 6 inter-hybrid ewes aged between 24 and 50 months. Platinum bipolar electrodes enabling the reception of active potentials were implanted into the ewes' uterine muscle layers. The ewes were sensitized with estradiolum benzoicum dosed at 1.25 mg per animal administered in two doses with a four-day break in order to activate the electrical activity of the uterus. During the 48th hour after the first dose of estradiol, rumen acidosis was evoked through the administration of a water solution of saccharosis into the rumen. Evoking the experimental acidosis had a blocking influence on the myoelectrical activity of the uterus. The length of the uterine myoelectrical activity period was shortened from 10-12 days in the control experiments to 5 days during the rumen acidosis. In comparison to control experiments, a dramatic fall in the uterine electrical activity was already visible 24 h after the administration of saccharosis. After 72 h of acidosis the uterine myoelectrical activity disappeared completely..