J. Anim Sci.
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J. Anim Sci. 1974. 38:89-94.
© 1974 American Society of Animal Science
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Telemetry of Uterine Motility in the Cycling Ewe1, 2,

A. R. Lehrer3, H. Fischler4, H. Schindler3 and M. Brown5

The Agricultural Research Organization, The Volcani Center, Bet Dagan

Abstract

Uterine motility during the estrous cycle of unrestrained ewes was assessed by monitoring pressures inside the uterine wall using a miniature pressure transducer and a radiotelemetric set-up. Measurements were possible at a distance of 20 meters.

An average of 1.4, 2.5 and 2.2 pressure-peaks per minute with an average amplitude of 20.5, 68.5 and 74.8 cm Y2O, were recorded in one ewe during proestrus, estrus and metestrus, respectively. During metestrus, 4 to 7 min. of successive pressure changes alternated with resting periods which lasted about 6 min. at the beginning of this stage, and became longer towards diestrus, in which very low pressure peaks or none at all were recorded. Similar results were obtained during 1 to 3 stages of the estrous cycle in each of four additional ewes.

The relationship between different methods of measuring uterine motility was discussed.

Footnotes

1 Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. 1972 Series, No. 2243-E.

2 This investigation was supported by a grant from the United States Department of Agriculture under P.L. 480. The authors gratefully acknowledge the help of Mr. A. Auerbach and Mr. S. Landman and Miss D. Havkin in preparing the data for computation; and thank Mrs. S. Shalom, Mr. E. Heffer and Mr. Y. Dimmerman for their technical assistance.

3 Department of Animal Science.

4 Department of Electronics, The Weizmann Institute of Science, Rehovot.

5 Department of Statistics, Tel Aviv University, Tel Aviv, Israel.






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