The fact that ultrasound is generally perceived as a safe imaging modality due to its use of non-ionizing radiation encouraged its increasing use in the diagnosis of cyesis in Veterinary practice. Ultrasound heating during obstetric scans has the potential of increasing body temperature via absorption. The study was conducted to determine the effect of multiple prenatal ultrasounds scanning on haematological parameters of rabbit fetuses. The research involves in vivo experimental model using 16 pregnant does and exposing them to ultrasound for average of 5 minutes at day 7, 12, 15, 20, 25, 27 and 29 of gestation. They were divided into two groups as insonated and control, the restrain and scanning procedures were mimicked on the group of does that were not scanned (positive control). Upon parturition, blood samples were collected from the kits via jugular venesection into ethylene diamine tetra acetic acid containing tubes for haematology. There was a significant reduction (p < 0.05) of red blood cell count and haemoglobin concentration of insonated group. Values of packed cell volume and platelet were lower but not significant (p > 0.05) in insonated as against the control while a non-significant slight increase in total white blood cell count was seen in the control. Therefore, ultrasound heating from multiple in-utero exposure can possibly cause alterations in haematological values in Rabbits.
Key words: Fetus, Haematology, Insonation, In-utero, Rabbit, Ultrasound