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In Se-deficient mice, the testosterone production after GnRH or LH stimulation was reduced

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The testicles contain high levels of Se (90), 274 48 ng/g wet weight, and are among the organs in the body with the highest Se concentrations (together with the thyroid gland, kidneys, and liver, followed by spleen, heart, lung, prostate, brain, muscle, pancreas, and gastrointestinal tract), containing double amounts compared to other parts of the male reproductive tract (epididymis, prostate, and seminal vesicles) (57, 91)

doi: 10.1016/j.fertnstert.2007.11.067

Poult Sci