Question:  query regarding oestrous of a local cow 
Answer: observe the animal for nest 21 days , from 18 day animal should keep on close observation for external signs of heat  if it shows heat symptom inseminate the cow after 17-18 hours of onset of oestrous , since the cow has a history with natural mating yesterday it may   consive already then - the cow will not show any sign of heat -- it indicate the cow is consive in natural mating , for conformative diagnosis rectal palpation after 40 -45 days or ultrasound method can be followed