Retrograde transfer of testosterone to the porcine ovary in follicular and luteal phase of the estrous cycle in vivo |
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Authors: | Wasowska Barbara Stefańczyk-Krzymowska Stanis?awa |
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Institution: | Division of Reproductive Endocrinology and Pathophysiology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, 10-747 Olsztyn, ul. Tuwima 10, Poland. bwasow@pan.olsztyn.pl |
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Abstract: | This study was designed to determine the efficiency and rate of testosterone (T) retrograde transfer during the follicular and luteal phase of the estrous cycle in gilts (n=27). The efficiency and the rate of the retrograde transfer of T from the ovarian effluent into blood supplying the ovary were determined for the first time under in vivo conditions. Ovarian arterial blood concentration of T was higher than that in systemic blood during both, the follicular phase (p<0.01) and luteal phase (p<0.0001). The efficiency of the retrograde transfer of T into ovarian arterial blood was not dependent on concentration of testosterone in the ovarian venous blood. However, the efficiency and the rate of the retrograde transfer of T differed between phases of the estrous cycle. The presented results suggest that local retrograde transfer enriched the porcine ovary with an additional amount of T which may affect the ovarian secretory function. |
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