Myoelectric activity in the intestines of healthy dairy cows during the recovery period after implantation of permanent electrodes

Mireille Meylan Clinic for Ruminants, Department for Clinical Veterinary Medicine, Vetsuisse Faculty of Berne, Bremgartenstrasse 109a, PO Box 8466, 3001 Berne, Switzerland.

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Richard Eicher Clinic for Ruminants, Department for Clinical Veterinary Medicine, Vetsuisse Faculty of Berne, Bremgartenstrasse 109a, PO Box 8466, 3001 Berne, Switzerland.
Present address is Faculté de Médecine Vétérinaire, 3200 rue Sicotte, CP 5000, St-Hyacinthe, J2S 7C6, QC, Canada.

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Marc Zulauf Clinic for Ruminants, Department for Clinical Veterinary Medicine, Vetsuisse Faculty of Berne, Bremgartenstrasse 109a, PO Box 8466, 3001 Berne, Switzerland.
Present address is Veterinary Clinic, Dr. V & D, Bisig, Wildbrunnstrasse 3, 8722 Kaltbrunn, Switzerland.

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Adrian Steiner Clinic for Ruminants, Department for Clinical Veterinary Medicine, Vetsuisse Faculty of Berne, Bremgartenstrasse 109a, PO Box 8466, 3001 Berne, Switzerland.

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Abstract

Objective—To describe myoelectric patterns in the intestines of cows after electrode implantation.

Animals—7 lactating Simmental-Red Holstein cows.

Procedure—Cows were implanted with 7 pairs of bipolar silver electrodes (1 each in the ileum, cecum, and proximal loop of the ascending colon (PLAC) and 4 in the spiral colon). Myoelectric activity was monitored during 10 periods within the first 3 weeks after surgery. Recordings from the first 2 weeks were compared with recordings from the third week, which was considered a steady-state condition.

Results—Significant changes over time were detected for 18 of 57 variables, including 3 variables describing myoelectric activity of the ileum, 6 variables of the cecum, 6 variables of the PLAC, and 3 variables of the spiral colon. Compared with values for the steadystate condition, 16 variables differed significantly for the 14-day period after surgery (7 variables until day 11, 2 variables until day 8, 4 variables until day 5, 1 variable until day 3, and 2 variables until day 2 after electrode implantation). None of the variables had significant changes that lasted only 1 day after surgery.

Conclusions and Clinical Relevance—Significant changes were observed for several variables of myoelectric activity in all intestinal segments until as late as 11 days after electrode implantation, whereas a steady-state condition was reached 14 days after surgery. Effects of drugs, manipulations, or nutrition regimens on myoelectric activity of the bovine digestive tract should be evaluated no sooner than 2 weeks after electrode implantation. (Am J Vet Res 2004;65:797–805)

Abstract

Objective—To describe myoelectric patterns in the intestines of cows after electrode implantation.

Animals—7 lactating Simmental-Red Holstein cows.

Procedure—Cows were implanted with 7 pairs of bipolar silver electrodes (1 each in the ileum, cecum, and proximal loop of the ascending colon (PLAC) and 4 in the spiral colon). Myoelectric activity was monitored during 10 periods within the first 3 weeks after surgery. Recordings from the first 2 weeks were compared with recordings from the third week, which was considered a steady-state condition.

Results—Significant changes over time were detected for 18 of 57 variables, including 3 variables describing myoelectric activity of the ileum, 6 variables of the cecum, 6 variables of the PLAC, and 3 variables of the spiral colon. Compared with values for the steadystate condition, 16 variables differed significantly for the 14-day period after surgery (7 variables until day 11, 2 variables until day 8, 4 variables until day 5, 1 variable until day 3, and 2 variables until day 2 after electrode implantation). None of the variables had significant changes that lasted only 1 day after surgery.

Conclusions and Clinical Relevance—Significant changes were observed for several variables of myoelectric activity in all intestinal segments until as late as 11 days after electrode implantation, whereas a steady-state condition was reached 14 days after surgery. Effects of drugs, manipulations, or nutrition regimens on myoelectric activity of the bovine digestive tract should be evaluated no sooner than 2 weeks after electrode implantation. (Am J Vet Res 2004;65:797–805)

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