I want to buy an HF cow.

HF is a good dairy choice if you want higher milk, but buy only after checking her in your presence. Milk her before paying, do a CMT test on all four quarters, ask which month of lactation she is in, and check age, body condition, and FMD and HS vaccination record. If she is above fifty thousand rupees, take a Pashumitra or vet with you. For steady fifteen plus liters, one cow is not enough; plan two cows with staggered calvings.