Seasonal changes in acid glycosidases from gander testes

Dżugan, Małgorzata; Droba, M.; Droba, B.

doi:10.1016/s0305-0491(00)00273-x

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…In our study, the weight of testes and number of Leydig cells decreased during the reproductive season (from the peak to the second half of reproductive activity) and declined further at the beginning of photorefractoriness. Likewise, the ratio of testes weight to total body weight in Zatorska ganders (Anser anser f. domestica) decreases from around 0Á24% (during the reproductive season) to about 0Á04% during testes involution in July (Chelmonska, 1972;Dzugan et al, 2000). A similar pattern is seen in Canada geese (Branta canadensis interior) during the post-breeding moult phase.…”

Section: Discussionmentioning

confidence: 55%

Effects of phytoestrogens on testosterone secretion by Leydig cells from Biłgoraj ganders (Anser anser)

Opałka¹,

Kamińska²,

Piskuła

et al. 2006

British Poultry Science

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The aim of this study was to examine ganders at different stages of the reproductive season and the effect of: (1) diets with high phytoestrogen content and (2) in vitro phytoestrogen treatment on testosterone secretion by isolated Leydig cells. Thirty-six male Biłgoraj geese were fed control diets with low phytoestrogen content (containing grass meal) and diets with high phytoestrogens (containing alfalfa meal and soy). Testes were obtained from both groups of ganders at three different times of the breeding season: peak of reproductive activity (March), second half of reproductive activity (May) and beginning of photorefractoriness (July). Isolated Leydig cells were incubated with LH as well as genistein, daidzein, equol and coumestrol and the concentration of testosterone in the medium was determined by radioimmunoassay. The mean weight of testes from ganders in May and July decreased relative to their weights in March, but no significant differences among experimental groups were noted. No differences were observed in basal and LH-stimulated testosterone secretion by Leydig cells of ganders fed the control diets and the diets with higher phytoestrogen content. In July, LH did not stimulate testosterone secretion in either group. In vitro treatment with genistein, daidzein and equol (5 and 50 microM) inhibited basal and LH-stimulated testosterone production by Leydig cells from both groups. Coumestrol (5 and 50 microM) inhibited basal testosterone secretion only in March in the control group. Dietary exposure to phytoestrogens had a slight effect on in vitro testicular secretion in ganders. In vitro treatment with phytoestrogen inhibited testosterone production by Leydig cells. Genistein showed the strongest effect and coumestrol had the weakest influence on testicular secretion.

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Section: Discussionmentioning

confidence: 55%