Nonsurgical Artificial Insemination in Mice.

Artificial insemination is used to impregnate female mice using a solution containing motile sperm. For nonsurgical artificial insemination, a blunt needle is inserted through the vaginal canal of naturally ovulating females that are in the proestrus/estrous phase. This method requires practice but can be mastered, although initially it may be easier to have two people perform the procedure. Naturally ovulating or superovulated females are used in the absence of natural mating. Artificial insemination is achieved by isolating sperm from the cauda epididymis and vas deferens into a milk solution and introducing it into the reproductive tract of ovulating females. Only females that are known to be in estrus are used.