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In springs 1972 and 1973, in one herd 69 Friesian-Holstein dairy cows were examined electrocardiographically before the beginnining of spring grazing and after 3 and 10 days of pasturing. Most cows displayed an acceleration of the sinus rhythm and increase of the contraction index after 10 days of grazing. After 3 days of grazing, ECG picture showed negative alterations of the T wave in same cows...
In 14 experiments, electrocardiograms (ECGs) were recorded in 6 cows before, during and after 4-day starvation with or without watering. Mainly, marked sinus bradycardia, decrease of the contraction index, and increase of the T wave amplitude were found. These changes intensified during the starvation period, most rapidly after the first day, and disappeared after returning to the normal feeding and...
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