Laboratory study on biorhythm of Oestrus ovis

The present study revealed the emergence of adult Oestrus ovis from the larva collected from the nasal cavities of sheep under laboratory conditions in and around Hyderabad. Maggots collected from the nasal cavities of sheep slaughtered were identified as belonging to Oestrus ovis by microscopic examination in the laboratory. The development of third stage larva was studied in the laboratory by allowing the larva to penetrate in to the soil for pupation and emergence of adult fly in a beaker kept inside the fly cage. The fly emerged out after 28 days of observation. Based on the morphological features, the third stage larva and adult fly were confirmed as belonging to Oestrus ovis.