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Haemocytes perform various physiological functions in the body of an insect. Total and specific haemocyte populations indicate the immunological status of an insect. The total number of haemocytes (THC) and the different haemocyte count (DHC) vary during the growth and metamorphosis of different breeds of the silkworm. The THC and DHC of a multivoltine breed were compared with that of a bivoltine breed in this work. THC of multivoltine breed ranged from 6.4 x 103/ mm3 on the 1st day to 10x103/mm3 on the 5th day. THC of bivoltine breed ranged from 3.2x 103/ mm3 on the 1st day to 6.4 x 103/mm3 on the 5th day. Only four different types of haemocytes were observed in the haemolymph of both breeds. They were prohaemocyte, granulocytes, spherule cells and oenocytoids. ʽtʼ test values indicate that significant differences were observed between the two breeds in terms of THC and DHC.