Female rabbits produce stillbirths as stillbirths. If the fetus dies in the uterus and does not abortion or output, but in the sterile environment of the uterus, moisture and other substances are gradually absorbed and finally calcified to form a mummy. There are many causes of fetal death. Most of the deaths in the birth are due to malposition of the fetus, or the fetus is overdeveloped and the perinatal period is too long. The pups are choked on the birth canal for a long time and suffocate; the causes of prenatal death are more complicated, such as the nutrition of the female rabbit. Poor, poor fetal development, decomposition of maternal tissue caused by ketoemia, resulting in fetal death; high-temperature stimulation during pregnancy, causing fetal death, termination of pregnancy; feeding on toxic feed or moldy deteriorating feed; mating or fatal, semi-lethal genetic inbreeding During pregnancy, illness, high fever and a lot of medication; mechanical damage to the fetus. In addition, the rabbits are too old and the stillbirth rate increases. As the fetus is too large and the perinatal period is prolonged, fetal death due to suffocation occurs mostly in pregnant females with fewer pregnancies and more first births. Male rabbits are not used for a long period of time, and mating females often have fewer litters. In order to prevent over-development of the fetus caused by dystocia or stillbirth, the nutritional level and feed supply of pregnant rabbits with a small number of plague should be limited. If there is no litter in 31 days, oxytocin should be used. Other causes of stillbirth should be targeted to prevent it. PCR-Fluorescence Probe Instrument Ultrafast Qpcr Instrument Hc800 ,2019-Ncov,2019Ncov Nucleic Acid,Portable Pcr-Fluorescence Probe Instrument Guangdong Hecin Scientific, Inc. , https://www.hecinscientific.com