THE DISTRIBUTION OF BLOOD CALCIUM IN THE CIRCULATION OF LAYING HENS

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Abstract
The object of this investigation was to determine the distribution of blood Ca in the circulation of laying and non-laying hens and to what extent Ca was taken directly into the blood stream from the food in the intestine. Laying and non-laying hens were anesthetized with chloral hydrate, venous and arterial blood obtained from different places in the circulation and Ca determined in the samples. In non-laying hens the blood of the anterior mesenteric artery going to the intestine and the blood of the anterior mesenteric vein coming from the intestine contain the same amount of Ca which shows the circulation to be in a state of Ca equilibrium. In actively laying hens the Ca content of the blood obtained from the anterior mesenteric vein is appreciably larger than that of the blood obtained from the anterior mesenteric artery and the blood from the left ventricle is intermediate between these values. In other words, the blood going to the intestine containing CaCO3 takes up Ca and passes through the veins to the heart where it is apparently-diluted with blood which must contain a smaller quantity of Ca.

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