Intrafollicular Pressure within Preovulatory Follicles of the Pig*†*Presented at the Thirty-Fourth Annual Meeting of The American Fertility Society, March 29 to April 1, 1978, New Orleans, La.†The opinions and assertions herein expressed are those of the authors and do not necessarily represent those of the Department of the Army or the Department of Defense. In con- ducting the research described in this report, the investigators complied with the Guide for the Care and Use of Laboratory Animals, as promulgated by the Committee on Revision of the Guide for Laboratory Animal Facilities and Care of the Institute of Laboratory Animal Resources, National Research Council. The facilities are fully accredited by the American Association for Accreditation of Laboratory Animal Care.