Progress on complex vertebral malformation in Holstein cattle
荷斯坦奶牛脊柱畸形综合征的研究进展

Complex vertebral malformation(CVM),a lethal autosomal recessive inherited defect in Holstein breed,was newly reported in Demark.If the proportion of CVM carriers in the nucleus breeding group of Holstein is high,great eco-nomic losses to dairy industry would be caused by the death of affected homozygous fetuses and the abortion of pregnant cows.The main symptoms and some important influences of CVM to dairy industry were reviewed,The process of re-searches on the CVM and the testing methods were explicated,and the status of potential CVM carriers in China was also discussed.