A professional who collects and packages bull semen for artificial insemination of cows. Respnsibilities include:

• Attaches rubber collecting sheath to genital organ of tethered bull, and stimulates animal's organ to excite ejaculation.
• Examines semen, using microscope, to determine density and motility of gametes, and dilutes semen with prescribed diluents according to formulas.
• Transfers required amount of semen to container, using titration tube, and labels it with identifying data, such as date taken, source, quality, and concentration, and records similar data on file cards.
• Packs container of semen in dry ice or liquid nitrogen for freezing and storage or shipment.
• May inseminate cows.