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. 1993 Jun 1;34(2):117–124. doi: 10.1186/BF03548199

The Effect of Induced Standing Reflex, Cervical Stimulation and Insemination on Intraluminal Pressure Variations in the Isthmus of the Oviduct in Unrestrained Gilts

A Pettersson 1,✉
PMCID: PMC8112521  PMID: 8266888

Abstract

Four gilts were each equipped with 2 ultra-miniature pressure sensors, placed at 2 different points along the same isthmus of the oviduct, on the morning of the first day of standing oestrus (Day 1). Intraluminal pressure recordings were started the same afternoon. After an initial recording period, intraluminal pressure was recorded while the gilts showed standing oestrus and during cervical stimulation followed by insemination with either 100 ml saline or 100 ml boar semen. Monitoring of the pressure variations in the isthmus was continued for up to 6.5 h after the last insemination. Blood samples for monitoring oestradiol-17B, progesterone and 15-ketodihydroprostaglandin F2α were collected before and after each manipulation of the gilt and every 30 min during the rest of the test period. None of the above manipulations had any consistent effect on the intraluminal pressure in the porcine isthmus, although, a clear 15-ketodihydroprostaglandin F2α peak could be seen after insemination with boar semen.

Keywords: oviductal isthmus, porcine, prostaglandin F2α

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Acknowledgments

This work has been supported by the Swedish Council for Forestry and Agricultural Research. Special thanks to Prof. Stig Einarsson and Prof. Hans Kindahl for their advice and to Marie Sundberg and Birgitta Berner for secretarial help and to the Department of Clinical Chemistry for performing the steroid analysis.

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