| The Dorset, Suffolk and Mongolian sheep after being embryo transplanted between gestation and puerperium were studied in the experiment. Among the sheep some were supplemented with selenium after the gestation of two months. In each species group, sheep were selected from each group supplemented with or without selenium as experimental group and control group. Blood sampled from the jugular in 90d, 60d, 30d, 15d in antepartum and 15d, 22d postpartum were analyzed for the levels of the ALB, TP, GOT, GPT, TG and CHO.The results showed,1. The level of the E2,P4 and GH were tested by radio-immunization, the result showed that the content of the three groups which were supplemented with Se were higher than that of the control groups in the different level at 15d and 22d postpartum. The content of serum E2 and P4 were higher than that of the control group in the different levels in the antepartum.2. The levels of the ALB, TP, GOT, GPT, TG and CHO were determined through the absorption spectrometry. the result showed that almost all the content of the three groups supplemented with the Se were higher than that of the control group in different levels at15d and 22d of postpartum.3. The experiment data comprehensively showed that, with the same nutrition and management, the imported species suffered more in the delivery stress than the Mongolian sheep. There were also more curve fluctuations of the serum indices of the sheep without the supplement of the selenium during the pregnancy than that without.4. This study showed that the level of the production hormone and the growth hormone were relatively high during the pregnancy. The level of the ALB, TP, GOT, GPT, TG and CHO were relatively low in the antepartum and high in the postpartum which maybe the result of the rising of the immune-ability because of the supplement of the Se. The curve was relatively stable for the Mongolian sheep supplemented with Se and the values were relatively high.
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