Our donkey serum is obtained from healthy herds and is rich in nutrients. It can be used as an additive for cell culture media or as a blocking reagent for immunoassays. Since more serum can be obtained from donkeys than from bovine fetuses, donkey serum is a more cost-effective alternative to fetal bovine serum (FBS). Compared to FBS, it contains more immunoglobulins and has a higher protein content.