Abstract
PREVIOUS studies at this station on the calcium metabolism in laying birds by the balance method as reported by Morgan and Mitchell (1938) showed large negative balances of this element following the onset of laying by pullets. The pullets remained in a cumulative negative balance for a period of 200 days or more. Later in the laying year, these birds regained calcium and cumulative positive balances were noted even with continuous egg production. Since extremely large cumulative calcium balances both negative and positive were recorded in these studies as well as other balance trials at this station, a comparison of the balance method with, and a check on, the calcium metabolism in laying birds by comparative slaughter was desired.EXPERIMENTALA group of Single Comb White Leghorn hens which had completed or nearly completed a year of egg production was used in this study. The entire group was force molted .
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