Japanese Journal of Veterinary Research;Volume 13, Number 3

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FETAL ELECTROCARDIOGRAM IN DAIRY CATTLE : I FUNDAMENTAL STUDIES

TOO, Kimehiko;KANAGAWA, Hiroshi;KAWATA, Keiichiro

Permalink : http://hdl.handle.net/2115/1824
JaLCDOI : 10.14943/jjvr.13.3.71

Abstract

Some fundamental problems on fetal electrocardiogram (F-ECG) were studied with 10 pregnant Holstein cows at various gestational stages. The results obtained will be summarized as follows : 1) It is possible to obtain a satisfactory F-ECG without electrical noise by the application of special electrodes and some suitable lead methods in dairy cattle under experimental or field conditions. 2) The positivity in F-ECG is 100 per cent during the period from 146 days of pregnancy to termination, whereas, at more early stages, F-ECG cannot be recorded by the procedures taken by the present authors. 3) The fetal heart rate has a tendency to decrease with the progress in fetal growth, averaging about 142 per minute at 161〜190 days in gestation (I), 141 at 191〜220 days (II), 128 at 221〜250 days (III) and 120 at 251〜280 days (IV), respectively. The differences between stages I vs. III, I vs. IV, II vs. III, and II vs. IV are statistically significant (P<0.01). 4) The pattern of fetal QRS complex varies depending on the different lead methods applied or gestational stages, particularly with its amplitude and polarity of initial deflection. Throughout the whole recordable period, the detection of F-ECG is usually superior when utilizing leads from the right side abdomen or rectum to other leads. 5) The clinical application of the F-ECG technique will be effective toward an accurate diagnosis of fetal death at the later half of gestation or multiple pregnancies.

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