Influence of Bovine Cervical Mucus Samples and Storage Conditions on Sperm Migration in Vitro**Supported in part by Grant HD-03471 from the National Institute of Child Health and Human Development and by Eastern Artificial Insemination Cooperative, Inc., Ithaca, New York 14850. Initial data were taken in part from a thesis submitted to Cornell University by H. L. Kummerfeld for the Ph.D. degree.