Biological half-lives of [4–14C]testosterone and some of its esters after injection into the rat

Abstract
Biological half-lives for 14C from labelled testosterone in muscle and whole body of rats have been measured after intramuscular injection of [4-14C]testosterone and its lower esters (formate to valerate). A relation has been observed between ethyl oleate-water distribution coefficients, biological half-lives in the rat and “times of maximum effect” in the rat and fowl.