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Lack of relationship between spontaneous fluctuations of fsh luteinizing hormone and testosterone and semen output quality in young postpubertal bulls

, : Lack of relationship between spontaneous fluctuations of fsh luteinizing hormone and testosterone and semen output quality in young postpubertal bulls. Zuchthygiene (Berlin) 20(5): 222-228

The secretory patterns of FSH, LH and testosterone were investigated in eight young postpubertal bulls from frequent blood samplings repeated on two occasions. These bulls were classified according to their semen output, evaluated from 15 consecutive weekly ejaculations, as good (n = 5 bulls) or poor (n = 3 bulls) semen producers. A lack of significant difference between the FSH, LH and testosterone patterns of good and poor semen producers was observed in the present study. It was concluded that as long as the physiological basic processes of spermatogenesis are initiated, poor semen output is not associated with drastic changes in the gonadotropins (FSH, LH) or testosterone secretions.


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