Abstract: The serum progesterone level of sables in pregnancy were determined by radioim-
munoassay (RIA ) from September 1986 to February l987． The results showed that the serum progesterone of female sables of calving keeped a stable relatively more high level from September 1986 to January 1987(average 1.45±0.23 ng／ml)，and increased sharply to peak value in last ten days of February 1987(average 3.72±1.67 ng／ml，P< 0.01)． The progesterone of femala sebles of barren were in low level during the pregnancy period (average 0.70±0.14 ng／ml)．
There was a significant or the most significant difference of the progesterone
between the female sables of calving and barren．Therefore，we considered that the change of serum progesterone level were a close relation to activity of embryo，and photoperiod．

Key words: Sable, Progesterone, Embryo, Radioimmunoassay

摘要： 用放射免疫法测定受配雌紫貂妊娠期间(9月至翌年2月)的血清孕酮水平。结果表明：其中产仔雌貂在9月至翌年1月的血清孕酮呈现相对稳定的较高水平(平均1．45士0.23毫微克／毫升)，2月下旬急剧升高至本试验的最高值(平均3．72士1．67毫微克／毫升，P<0.01）；空怀雌貂在妊娠前期内的血清孕酮水平均为0.70士0.14毫微克／毫升的低水平，与产仔组相比，差异显著或极显著。作者认为血清孕酮水平的变化与日照和胚泡活动密切相关。

关键词: 紫貂, 孕酮, 胚泡, 方射免疫