Abstract
Blood of Rhode Island Reds was taken via cardiac puncture and analyses carried out in the Tiselius apparatus. Pronounced sex differences in sera do not appear until maturity and become pronounced with age. Hen and cock serum patterns are reversed by contra-sex hormones. The comparison of chicken serum before and after ether extraction indicates that the sex differences observed in electrophoretic patterns are largely removed upon ether extraction (e.g., the f-com-ponent in hen and the a-component in cock sera disappear).

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