You need 20 lakhs excluding land of 2.5 acres, and this will include cost of cows, transportation, housing (dairy shed), machines for milking with 2 buckets, cow mats, fodder harvesting machines, chaff cutter for fodder chopping etc . Good luck!!.
You need a 80 ft inner space building if its single sided or 40 ft on one side in case of a back to back system with a 6 feet passage in the center. Split roofing ideal. Plan drainage system right in the beginning and the waste water, shed cleaning water must flow towards the fodder cultivation areas through channels.