Protocol describes oviduct transfer of mouse embryos. It is based on the Whittingham method, which applied a well described procedure for the rat to the mouse. It is best to practice this procedure first on a cadaver and then on an anesthetized 0.5-dpc pseudopregnant mouse using a dye solution or blue Affigel beads rather than embryos to gain experience in finding the opening of the oviduct (infundibulum). - [Read Oviduct Transfer Protocol]