Hypoglycaemia was recorded in an experimental study on equine piroplasmosis caused by Babesia equi. A significant dropping in blood glucose level was observed post-infection allover the experi mental period. The main glucose level at the 4th. and 5th. weeks post-injection in BCG vaccinated animals were 50.0 & 60.9 mg./dl., 33.3 mg/dl. for BCG vaccinated splenectomized animals and 69.6, 53.8 mg./dl. for Imizol treated and Imizol splenectomized groups respectively. higher consumption of glucose was obsderved post splenectomy that may be related to high parasitaemia. However the blood glucose tolerance test was not apparently altared.