Heihavand M., R. Nori, M. A. Edriss, A. H. Mahdavi. H. R. Rahmani and M. Talebi. 2012. The effect of polymorphism of alpha 1-antitrypsin on milk yield and somatic cell score in Holstein cattle. 5th Iranian Congress on Animal Science. 29-30 August, 2012, Isfahan, Iran.