TSR (thing)

TSR: an acronym from the words Testosterone Sterilized (female) Rat. A TSR manifests the persistent estrus syndrome. Lacking ovulatory cycles, she is sterile. The condition is induced experimentally by injections of testosterone prior to the age of eleven days. The first five days of life are the most sensitive or critical ones. Smaller doses are then effective. The effect is life-long.

Dictionary of Sexology Project: Main Index