Abstract: A warming and storage unit for quickly thawing frozen artificial insemination materials and in which such materials and insemination guns used in such operations may be stored at desirable temperatures while awaiting use. The unit includes a metal block provided with a thermostatically controlled electric heater means. The block has an elongated vertically extending central well for receiving semen capsules for thawing and a horizontally extending compartment spaced from the well and being of such size as to accommodate and store at least one artificial insemination gun. The metal block is enclosed in a heat insulating housing provided with openings for access to the well and compartment.