Cardiac Arrhythmias in Normal Holstein Heifers

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  • ホルスタイン種育成牛の不整脈
  • ホルスタインシュ イクセイギュウ ノ フセイミャク

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Abstract

The incidence of arrhythmia was examined on 269 normal Holstein hifers, of which 10 animals showed 4 types of arrhythmia. In five cases, Wenckebach type sino-atrial block was found. Sinus arrhythmia (2 cases), second degree atrio-ventricular block (2 cases) and Wenckebach type sino-atrial block plus atrioventricular junctional premature contraction (1 case) were detected. These arrhythmias in clinically normal heifers would in most cases be due to physiological factors induced by increased vagal tone and may differ from those generally observed in lactating Holstein cows.

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