Abstract
Electrophoretic observation was carried out on blood sera of three calves. Sera of new born calves contained no γ-globulin. It appeared after ingestion of colostrum, but its content was very low for two Holstein calves, it may be, as their initial suckling of colostrum was too late after birth (one day after birth). The serum of another calf (Guernsey) which received colostrum within 10 hours after birth contained it considerably.This globulin which appeared in the serum of calf during ingestion period of colostrum fairly agreed with colostrum globulin electrophoretically. The slowest moving component, which is present in cow's serum, was apparently appreciable in the serum of calf after three months of birth, but it was still less than that of cow's serum. This component is probably no related to ingestion of colostrum.Als in new born goat's serum, no γ-globulin was found. But appearance of this component was not successfully found within several hours after initial suckling.
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