Relationships between short-term variations of LH, FSH, prolactin and testosterone in peripheral plasma of prepubertal bulls

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Abstract
In 2 prepubertal bulls 10 min blood samples collected during a 24 h period showed that gonadotropin and testosterone peaks occurred regularly at intervals of 6 h in 1 animal and 8 h in the other. There was a clear relationship between the LH [lutropin], FSH [follitropin] and testosterone peaks. The increase of gonadotropin levels was followed 20 .+-. 6 (SD) min later by an increase of testosterone; the interval between the peak values was 61 .+-. 9 (SD) min. The pattern of prolactin concentrations differed; there were 2 prolonged elevation rather than regular peaks.

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