1. Days five to thirteen are known as the pre-ovulatory stage. 2. The discovery enriched medical knowledge of the 28-day ovulatory menstrual cycle. 3. Spermatozoa has been observed in pre-ovulatory females. 4. Infrequent and light menstruation occurs in about 40 % of women with ovulatory dysfunction. 5. Indeed, studies have shown that women's preferences vary across the ovulatory cycle. 6. However, mucus and temperature systems have certain limitations in determining pre-ovulatory infertility. 7. The World Health Organization ( WHO ) has developed the following classification of ovulatory disorders: 8. This is because during the cells are constantly stimulated to divide while ovulatory cycles continue. 9. Amenorrhea ( absence of menstruation ) occurs in about 20 % of women with ovulatory dysfunction. 10. The presence of ovulatory follicles of the proper size only means the mare is ready for mating.
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