Sentence:  However, it would be highly useful if the <WSD>ejaculated</WSD> spermatozoa could be successfully cryopreserved and the frozen-thawed spermatozoa used for in vitro fertilization, since this would allow the genetically valuable rats to be maintained alive rather than sacrificed. 
Meaning of the word marked with <WSD> tags:  Of a human being or other mammal: to forcibly eject from the urethra in response to sexual stimulation, in a male, semen; and, in a female, vaginal fluid.