Abstract
Summary
An operative technic for the removal of the yolk from day-old chicks has been described. This procedure was developed to render chicks relatively free of the nutrients transmitted through the yolk from the dam. Observations on the growth rate of deutectomized chicks as compared with that of unoperated controls show that the operation had little or no effect on growth when an adequately supplemented diet was supplied. The results of these trials demonstrate that vit. B12 or a substance possessing vit. B12 activity was present in the yolk of the day-old chick and that it was removed by deutectomy.
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