Corpora lutea induced in the ovaries of sheep during the breeding season by use of pituitary gonadotropic extracts did not alter the rhythm of the estrual cycles in a uniform manner. Their next heat periods did not all occur at the same time irrespective of the stage in the estrual cycle at which the corpora lutea were produced (Casida, Dutt and Meyer, 1945). Thus, it would appear that the mechanisms for maintenance of the corpora lutea tend to be synchronized with the corpora lutea of the last heat rather than the artificially produced ones. The effect of corpora lutea on the cyclic rhythm has been demonstrated in several species. Williams and Williams (1921), Hammond (1927) and McKenzie and Terrill (1937) reported that removal of the functional corpora lutea from the ovaries of the cow and the ewe will hasten the time of onset of estrus.
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Dutt et al. (1948) studied this question.