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Oestrogen content of semen and the effect of exogenous oestradiol-17β on the oestrogen and androgen concentration in semen and blood plasma of bulls

Summary. The concentration (mean±S.E.M.) of oestrogen in semen (0·89±0·04 ng/ml) of bulls was 8·9-fold higher than in blood plasma (0·10±0·01 ng/ml) while the concentration of androgen in semen (1·15±0·26 ng/ml) was 2·7-fold lower than in blood plasma (3·21±0·47 ng/ml). This concentration of oestrogen in semen was not influenced by 0,1,3 or 5 false mounts or when ejaculations occurred at 2-min intervals. When 100 mg oestradiol-17β were injected i.v. the oestrogen level in semen followed that in the plasma.

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