Annual profiles of reproductive hormones in peripheral plasma of the male roe deer (Capreolus capreolus)

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Abstract
Blood samples were collected from 13 roebucks 1-3 times per mo. during several yr to study the relationship between season and concentrations of LH [luteinizing hormone], FSH, testosterone and prolactin. Plasma values of all of these hormones began to increase during the 2nd half of Feb. LH, FSH and testosterone levels reached a plateau during April. Highest average levels of LH and testosterone were observed before the start of the rutting season (mid-July-mid-Aug.) and steadily declined thereafter. In contrast to LH and testosterone, FSH concentrations decreased 6 wk earlier, during June, indicating a modulated secretion pattern. Prolactin steadily increased until the beginning of July and then decreased.

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