This book gives a complete knowledge on the reproductive hormonal and biochemical profile in cattle reared under island and coastal ecosystems. The basic difference in haematological, biochemical and hormonal 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. 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.