Changes in the Protein Content of Yolk during Chick Embryogenesis

Abstract

ABSTRACT The original purpose of the present investigation was to determine the rate of degradation of phosphoprotein in the yolk at different times during embryogenesis as a preliminary to examining the mechanism of its assimilation, and to see if phosphoprotein and other proteins were assimilated at different times or at markedly different rates. The early work on the assimilation of yolk protein has been reviewed by Needham (1931) and few pertinent papers have appeared since then (Schenck, 1932; Rupe & Farmer, 1955; Walter & Mahler, 1958). Recently Holoubek & Brada (1956) have made an extensive examination of the distribution of phosphorus compounds in the egg during embryogenesis.