EN
Bovine leukocyte adhesion deficiency (BLAD) and citrullinemia are two autosomal recessive genetic diseases in Holstein cattle and both result in death of homozygous animals. Through the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technology and DNA sequencing, one citrullinemia and three BLAD carriers were found in a population of 615 Chinese Holstein cattle, including 436 cows and 179 bulls. Citrullinemia and BLAD carrier frequency was 0.16% and 0.49%, respectively, in tested Chinese Holstein cattle. In this study, the first citrullinemia carrier occurring in Chinese Holstein cattle is described, although the world frequency of this disorder is very low.