Question:  query regarding parturation [ calving ] of a cow reaching full term of pregnency 
Answer:  let the animal keep calm & quite environment / observe from a distance ( force extraction may require -- [, if expulsive force is not adequate ] hot fomentation on the pelvic area , if  it is utokia -- it is okey,but if dystokia i.e the calf is not in proper position  correction may require after 4 -5 hours . infusion  of  normal saline/ injection of  meloxicam , dexona , progesterone, antibiotic , furea bolus etc may require  to overcome the problem //  episiotomy /, ceasarean section/, fetotomy  may require  if the case is consider dystokia afterexamination .