サラブレット, ポニーおよび乳牛の胎仔ならびに新生仔心拍数の加齢にともなう変化

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  • Alterations in the heart rate of Thoroughbred horse, pony and Holstein cow through pre- and post-natal stages.
  • サラブレット,ポニーおよび乳牛の胎仔ならびに新生仔心拍数の加齢にともなう変化〔英文〕
  • サラ ブレット,ポニー オヨビ ニュウギュウ ノ タイシ ナラビニ シンセイシ

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Alteration of the heart rate through fetal, newborn and young stages were traced in Thoroughbred horses, ponies and Holstein cows. The heart rate in these fetal animals progressively decreased with the advance in gestation. After birth, the heart rate of newborns increased temporarily to a higher level but soon started to decrease and gradually reached their respective adult levels at about 4 to 5months of age. Using newbom pony foals whose heart rate were decreasing with the advance in age, we examined the effect of atropine and/or propranolol on their heart rate. The heart rate decreased significantly after the injection of propranolol, whereas it increased significantly after the injection of atropine. With the advance in age, the magnitude of the heart rate change by atropine became progressively larger, whereas that by propranolol became progressively smaller. In their dams, the heart rate did not alter after the injection of propranolol, whereas it increased significantly after the injection of atropine. A marked difference in the response to propranolol was found between newborn foals and their dams. The heart rate in newborn foals and dams increased significantly after a combined injection of atropine and propranolol and the heart rate after this treatment was significantly slower in the dams than in the newborn foals.

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