Abstract
IN a previous paper by Deobald, Lease, Hart, and Halpin (1936) it was shown that the blood calcium of the laying pullet does not show any marked variation during an entire laying cycle and that approximately 10 percent of the calcium in the bones of a laying pullet is available for egg shell formation when the calcium is removed from the ration.Feinberg, Hughes, and Scott (1937) and Common (1936) have published data in substantial agreement with these findings. Common (1936) has shown quite wide variations in calcium content of the blood of individual hens over a four-month period when samples for analysis were taken at approximately monthly intervals.Riddle (1926) working with pigeons, and Roepke and Hughes (1935) working with laying pullets, have reported a marked rise in total serum phosphorus when the birds approach sexual maturity. The rise in blood calcium during this period is also well known .
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