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Description: This 6-minute WMV video was produced by Select Sires, a cattle artificial insemination business located at Plainfield, Ohio, to explain how bulls are ejaculated to collect semen and how semen is processed and frozen in straws ready to be delivered to dairy farmers and beef producers. It describes sexual preparation of bulls to optimize sperm output, collection of the ejaculum with an artificial vagina, evaluation of semen quality, extending the semen, dispensing extended semen into labeled straws, freezing semen to -195 degrees C, and storing frozen semen in liquid nitrogen. This video is intended to be an explanation of the procedures, rather than to train people to perform these tasks. The semen collection portion of this video is available in a separate file NAL #5006, and the semen processing part is available in NAL #5007.