Abstract

An injection of an antiserum raised against partially purified chicken LH (fraction CM2) in laying hens resulted in a cessation of laying for about 5 days and caused extensive atresia of the ovary. Ovulation was blocked before there were macroscopic signs of follicular atresia. Since the antiserum contained antibodies against TSH and possibly FSH, these effects may not have been entirely due to the inhibition of LH activity.

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