I want to buy this cow

Good dairy choice, but verify her properly before paying. Milk her in your presence, do a CMT test on all four quarters, ask which month of lactation she is in, and check age, body condition, and vaccination record. If she is above fifty thousand rupees, take a Pashumitra or vet with you. If you want fifteen liters consistently, one cow is not enough; plan two cows with staggered calvings.