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Plasma androstenedione and testosterone in reindeer bulls treated with medroxyprogesterone acetate (MPA) before the onset of rut. Eight bulls were divided into 2 groups: bulls (n = 4) with previous breeding experience (E) and bulls (n = 4) with no breeding experience (IE). The * indicates significance (P = 0.001). Testosterone levels in E bulls were greater than levels in IE bulls at all sampling dates and differed from E bulls at all post-MPA sampling dates.
