Abstract
IN RECENT years attention has been attracted to the fact that the domestic hen metabolizes about 5.5 gms. of calcium carbonate to form an egg shell in approximately 14 to 18 hours. The mechanism involved for the regulation and deposition of so large an amount of calcium in the relatively short period of time is of fundamental importance.That there is a definite rise of serum calcium in mature pullets as they approach their laying period has been repeatedly demonstrated. Riddle and Reinhart (1926) in work with pigeons found that this rise in serum calcium occurs at least five days before any egg shell formation takes place. Russell, Howard, and Hess (1930) correlated this rise in serum calcium with the development of the ova and MacOwan (1932) has been able to demonstrate marked parathyroid development coincident with the growth of the ova in the hen.Buckner, Martin, and Hull (1929) .
Published Version
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