LITTLE is KNOWN about the normal process of ovulation in the cat. j Whether it occurs spontaneously, requires the stimulus of coitus or comes about in both ways has not been definitely established. Gruelich (i) found that 9 out of 12 cats, which were in estrum and in which the vagina was stimulated mechanically, ovulated, but he lacked controls showing failure to ovulate spontaneously. Van der Stricht (2) believes, from many observa' tions, that coitus is essential. Longley (3) reported that 5 unmated cats in estrum failed to ovulate. But 4 of a group of 10 which were mated likewise failed to ovulate although they may have been killed too soon. Manwell and Wickens (4) observed no ovulation in unmated cats killed during estrum. The evidence for spontaneous ovulation is inconclusive. Bonnet (5) found a tubal ovum in a cat which had been segregated from the male.
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William F. Windle (1939) studied this question.