Quinestrol is a synthetic estrogen and often used as contraceptive. Previous studies found that quinestrol had a significant effect on fertility control of murine population. In order to test the effect of quinestrol on Mongolia gerbil( Meriones unguiculataus),field experiments were conducted in Xilinhaote city of Xilinguole,Inner Mongolia Autonomous Region,in May 2006. The experimental area was divided into test region and control region. Quinestrol was applied in test region in May,and trapping-census wer...