Abstract
Summary
The egg-shell membranes of the chicken, duck, and turkey contain 0.66 to 1.00% hydroxyproline depending upon species. The remainder of the contents of the egg contains no detectable amount of hydroxyproline. Hydroxyproline appears in detectable amounts in the chick embryo after the fourth day and increases to 1.16% of the dry weight on the nineteenth day. The serosa contains hydroxyproline after the fifth day which increases to a maximum of 2.1% on the fourteenth day. Most of the hydroxyproline of the embryo and serosa is present in a form extractable by autoclaving, probably as collagen.
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