author(s)
DK Chaurasia, AK Barik, PC Mishra, SS Biswal, B Jena, P Perumal and S Sathapathy

abstract
The present study was conducted in the Department of Animal Reproduction Gynaecology and Obstetrics, College of Veterinary Science and Animal Husbandry, OUAT, BBSR in collaboration with ICAR-Central Island Agricultural Research Institute, Portblair (Andaman and Nicobar Island). Crossbred cattle with the history of anoestrus and repeat breeding were considered for the present investigation. The basic difference in haematological profile of cattle reared under two quite different ecosystems namely Island and coastal ecosystem was estimated which might be due to the variability in rainfall, ambient temperature, day light length and humidity. The incidence of different infertility conditions in both the ecosystems also might vary as per the environment. Serum samples were collected and analysed for various haematological parameters such as haemoglobin, total erythrocyte count (TEC), packed cell volume (PCV), total leukocyte count (TLC) and differential leukocyte count (DC). The overall incidence of infertility was recorded to be 47.62% in island and 45.90% in coastal ecosystem. In case of anestrus, the PCV, Hb, TEC, TLC values were significantly higher (p < 0.05) in island cattle as compared to coastal cattle. The lymphocyte value was significantly higher (p < 0.05) in case of coastal cattle as compared to cattle reared under island ecosystem. But in case of repeat breeding the Hb, TEC, TLC and eosinophil values were significantly higher (p < 0.05) in island cattle as compared to cattle reared under coastal ecosystem. It was concluded that the variations in humidity, ambient temperature, rain fall and day light length between Portblair, Andaman and coastal climate of Odisha, did not have much effect on reproduction of cattle.