Question:  query regarding oestrous of a  heifer showing the first sign of heat 
Answer:  told him to deworm the animal with suitable anthalmintic& provide good nutrition with minerals, vitamin & liver tonic , when 3rd estrous will appear[ after [42-45 days of 1 st heat ] then go for artificial insemination  with good semen to get better conception  [thete is not hard & fast rule that in 1 st heat insemination can not be done]