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Description: This 20-minute video was produced by Select Sires (an artificial insemination business) for their programs training artificial insemination technicians and educating farmers. It outlines the structure and function of the ovaries, follicles, corpora lutea (CL), oviduct, infundibulum, isthmus, ampulla, tubo-uterine junction, uterine horns, uterus, uterine body, cervix, fornix, annular rings, vagina, urethral opening, vestibule, vulva, clitoris and pituitary gland. The estrous cycle is presented including follicular phase, follicular waves, dominant follicles, ovulation, ova transport, fertilization, luteal phase, maternal recognition of the embryo and corpus luteum regression. The roles of estrogen, progesterone, prostaglandin and FSH are discussed. Finally, there is a brief discussion of gestation including fetal membranes, caruncles, cotyledons, and parturition and including the hormones involved. The discussion of the endocrinology of the estrus cycle is simplified in keeping with the intended practical purpose of the video. For example, the discussion of the endocrine control of the cycle does not include LH (Luteinizing Hormone) or the complexities of negative feedback of ovarian hormones on the pituitary and hypothalamus. Also, the reference to maternal recognition of pregnancy at days 16-18 after fertilization is from a practical point of view, while the biological events are thought to be at 15-16 days.