Dairy is highly profitable business as there is a grate demand for milk and milk products,
as per your land availability and investments plan you can decide number of cows
Suitable breed HF and Gerssy each cost around 50 to 75 thousond cost of maintenance can be 25 to 30 thousond/year infrastructure arund 7 lakhs for 10 cows. each cow can yield 25-50 ltrs. please visit ZHARS,Brhammavara where cows, rabbits,sheeps have been maintained it will definatly help you.
Finally bank will also provide subsidy for this venture.
Regards
kirti s