Abstract
During 39 months of sampling, the prevalence of apicomplexan parasites (Haemoproteus and Plasmodium) was studied in Columba livia Gmelin of Rohilkhand region, UP, India, according to the sex of the host, different seasons and host localities. Out of 266 pigeons sampled, 148 pigeons were positive for Haemoproteus at a prevalence of 55.63%. Only 18 pigeons (2.67%) had a dual Haemoproteus and Plasmodium infection and 130 pigeons (48.87%) had Haemoproteus infection. No pigeons were positive for Plasmodium alone. Parasite incidence in relation to the sex of the host indicated a higher infestation in females (62.79%) as compared to males (57.65%). The overall highest infectivity of parasites was recorded during the summer season (82.85%) followed by spring season (59.37%) and least in the winter season (42.30%). It was also observed that Haemoproteus occurred at diverse infectivity in C. livia from different localities (Badaun 51.35%, Bareilly 57.14%, and Shajahanpur 58.06%) whereas Plasmodium was recorded at 11.18% only from Bareilly. The intensity of the parasite was highest (2.77/100 RBC) at Shahjahanpur.