Crystallization Patterns of Cervical Mucus as Related to Estrus in Beef Cattle

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Abstract
Preliminary investigations indicate that the crystallization patterns of cervical mucus appear related to ovarian activity of beef heifers. The 1st indications of the fernlike patterns of crystallization became evident about 3.5 days before estrus. These patterns reached a maximum in extent at the time of estrus and began a decline before ovulation occurred. Reasonable care must be exercised, but extensive equipment and aseptic conditions are not essential for obtaining satisfactory results.