Claus R, Schopper D, Wagner H G
J Steroid Biochem. 1983 Jul;19(1C):725-9. doi: 10.1016/0022-4731(83)90003-1.
Unconjugated testosterone (T), 5a-androst-16-en-3-one (delta-16), dihydrotestosterone (DHT), unconjugated (u Oe) and conjugated oestrogens (c Oe) were determined weekly in the peripheral blood plasma and seminal plasma of 8 boars for a period of 15 months. Four of the boars were kept under natural daylength fluctuations (8-17 h), and 4 boars on a light programme which shifted these fluctuations by half a year. In peripheral plasma of all boars the highest concentrations were found for c Oe (17 ng/ml) followed by delta-16 (7.3), T (2.2) DHT (0.75) and u Oe (0.24). In seminal plasma of all boars (with an average volume of 172 ml) the highest concentrations were again found for c Oe (5.9 ng/ml) followed by delta-16 (1.1), u Oe (0.73), T (0.28) and DHT (0.1). This shows that u Oe reach higher concentrations in seminal plasma than in blood plasma. In boars under the influence of natural daylight steroids fluctuated with season. Maximum concentrations were present from October till December. Minimum concentrations were about 1/10 of the maximum concentrations. All steroids measured in blood and semen were similarly affected and all were highly correlated. In boars on an artificial light programme the off-season depression during the summer was completely restored. This indicates that daylight fluctuations are the main reason for seasonal changes of testicular function in the domestic boar.
在15个月的时间里，每周测定8头公猪外周血浆和精浆中未结合睾酮（T）、5α-雄甾-16-烯-3-酮（δ-16）、双氢睾酮（DHT）、未结合雌二醇（u Oe）和结合雌二醇（c Oe）的含量。其中4头公猪处于自然日照时长波动（8 - 17小时）环境中，另外4头公猪处于光照程序使这些波动提前半年的环境中。在所有公猪的外周血浆中，c Oe的浓度最高（17纳克/毫升），其次是δ-16（7.3）、T（2.2）、DHT（0.75）和u Oe（0.24）。在所有公猪的精浆中（平均体积为172毫升），c Oe的浓度同样最高（5.9纳克/毫升），其次是δ-16（1.1）、u Oe（0.73）、T（0.28）和DHT（0.1）。这表明u Oe在精浆中的浓度高于血浆。在自然日光影响下的公猪中，类固醇激素随季节波动。10月至12月出现最高浓度。最低浓度约为最高浓度的1/10。血液和精液中检测的所有类固醇激素受到的影响相似，且都高度相关。在接受人工光照程序的公猪中，夏季的淡季抑制现象完全恢复。这表明日照时长波动是家猪睾丸功能季节性变化的主要原因。
