Cattle
Hi Binoy
You should research on the internet or books to decide on what kind of Cattle you are deciding upon (Cow, Buffalo,Horse, Goat, Sheep Pig, Poultry..)- then delve deeper into the nutritional , Health & Management of the animal. Start on a small scale / consult people who are running farms... By the way where are you planning to start one / your scale on investment..?
Its easy to get excited on starting a venture - but its your perseverance & interest that will have to get you going in the long run. Hope I am not discouraging - If you Love animals - please go ahead and make plans
Regards