Black desi gay

Black desi cow usually means an indigenous dairy cow, and for milk I would first look at Sahiwal or Gir type animals. Check her milk in your presence, do a CMT test on all four quarters, and ask which month of lactation she is in. If she is above fifty thousand rupees, take a Pashumitra or vet with you. For steady fifteen litres or more, one cow is not enough; you need two with staggered calvings.