introduction The release of ovulating hormone in the chicken (as well as in certain other spontaneously ovulating forms) may be conceived of as taking place either as an instantaneous discharge from the pituitary, or as a slow discharge over a period of one to several hours. Although we are inclined to the view that release in the chicken is more of an instantaneous than a slow discharge, we are unable to say now that it takes place definitely in one way or the other. Because of this, the term release in this and the accompanying paper (Rothchild and Fraps 1949) is used with certain reservations. By it is meant that point in the process of ovulation at which an amount of ovulating hormone adequate to cause ovulation is present in the blood stream, regardless of whether this amount left the pituitary immediately or over a period of some hours before.
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ROTHCHILD et al. (1949) studied this question.