Plasma testosterone in bulls. Seasonal variation
Abstract
Levels of peripheral plasma testosterone and LH were studied in 4 bulls hourly during a 12 hr. sampling period at 5 times of the year. The average plasma testosterone levels were significantly lower in October (1.8 ng/ml, Ρ < 0.001) and December (2.5 ng/ml, Ρ < 0.05) than in February, June and August (3.5, 3.7 and 3.7 ng/ml respectively). LH showed a slight fluctuation during the day, with values ranging between 0.8 and 3.8 ng/ml, but underwent no significant seasonal variation. A significant increase in average plasma testosterone was observed 1 hr. after the LH peaks (P < 0.001).
Plasma testosterone og LH nivået ble studert hos 4 okser i prøver tatt hver time i en 12 timers perióde ved 5 forskjellig tider av året. Gjennomsnittlig plasma testosteron var signifikant lavere i Oktober (1,8 ng/ml, P < 0,001) og desember (2,5 ng/ml, P < 0,05) enn i februar, juni og august (henholdsvis 3,5, 3,7 og 3,7 ng/ml). LH svingte litt i 1øpet av dagen. Plasma konsentrasjonen varierte fra 0,8 til 3,8 ng/ml, men viste ingen signifikant årstids varias] on. En signifikant øking i plasma testosteron ble observert en time etter LH toppene (P < 0,001).
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