Yes they do ... the types of leukocytes that are common in colostrum are as follows
Neutrophil 50 %
Macrophage 40 %
Lymphocyte 10 %
So the breakdown of major components of colostrum are:
Immunoglobulins, Lactoferrin, Proline-rich polypeptide, Growth factors, Growth hormone, Leukocytes, Enzymes, Cytokines and lymphokines, Vitamins, Minerals, Glycoproteins, or protease inhibitors, Sulfer....etc
Just do a Google search on Colostrum and you can find out more information or go to wikipedia and get an overall view.