The physiological levels of androstenedione and testosterone in muscle, kidney and fat of calves, bulls and heifers were determined by RIA. The androstenedione showed the highest levels in fat and the lowest in muscle tissues. Testosterone showed the same distribution only in male animals, whereas in females the highest levels were in kidney. In fat tissue androstenedione was constantly higher than testosterone in all examined animals. In muscle tissue androstenedione levels were higher than those of testosterone in all female animals and in male calves, whereas testosterone was higher in bulls. Testosterone was the main androgen in kidney tissue in both young and adult animals, irrespective of sex. © 1986.
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