Circadian variations of plasma LH and testosterone in adult swamp buffalo bulls
1981
Peerasak Chantaraprateep
Three swamp buffalo bulls aged 1.5, 1.10 and 2 years were submitted to frequent blood sampling every 15 m within a period of 25 hrs. Plasma LH and testosterone were quantified by radioimmunoassay method. The levels of the 2 hormones in each individual exhibited episodic and nonrhythmic patterns. The number of LH peaks varied according to individuals ranging from no peak in one bull to 2 in the other 2 bulls. The mean concentrations during the period of study for each bull were 0.74, 0.33, and 1.17 ng/ml. Whereas the number of testosterone peaks varied between 1-10 and the average testosterone concentration were 0.1, 0.33 and 0.55 ng/ml for the younger to the older bulls respectively. The testosterone peaks related to LH peaks in each individual bull.
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