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Fetal Electrocardiograms in Dairy Cattle¹

U. S. Department of Agriculture and University of Maryland, College Park

Abstract

Data from studies on the use of fetal electrocardiography with 46 head of dairy cattle were obtained. Fetal electrocardiographs could be obtained with a very high degree of accuracy during the last trimester of pregnancy. Multiple pregnancies could be detected with ease. The fetal heart rate decreased with fetal age. Amplitude of the fetal R wave and polarity of the fetal R wave, appeared to vary with fetal movement.

Fetal electrocardiography, using the cow as an experimental animal, might be a useful tool in studies on factors affecting the fetal heart.

¹ Contribution No. 4010, Scientific Article No. A–1401 of the Maryland Agricultural Experiment Station, Department of Dairy Science.

² Animal Husbandry Research Division, A.R.S., U.S.D.A., A.R.C. Beltsville, Maryland.

³ Dairy Science Department, University of Maryland, College Park.

⁴ The authors appreciate the help of R. L. England, University of Maryland in handling the cattle and of Dr. G. V. Richardson for conducting the statistical analysis and of E. W. Dwyer for technical assistance.