Plasma Testosterone in Bulls |
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Authors: | Sundby A Tollman R |
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Institution: | 111.The Department of Physiology, Veterinary College of Norway, P.O. Box 8146, Oslo Dep., Oslo 1, Norway ; |
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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). |
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