Research Journal of Microbiology1816-4935xxxx-xxxxScience International10.3923/jm.2017.243.247GhanieiAbolfazl AbtahiSeyed Meysam HajianMilad 42017124Background and Objective: Hemmaglutination Inhibition (HI) is the most common serological assay for detection of immune response in poultry to investigate Newcastle Disease (ND). Also, Egg yolk provides good alternative for blood samples because it is not invasive and also reduce stress in poultry. Nevertheless, there is no standard method for antibody extraction from egg yolk. The objective of this study was to compare two commercial methods (Chloroform and Ammonium Sulfate Extraction) for isolation of antibodies from egg yolk. Materials and Methods: In this study, 91 eggs of 7 layer flocks of East Azerbaijan province (Northwest of Iran) included. NDV antibody titers of yolk samples were measured after chloroform and ammonium sulfate extraction by HI. Statistical analysis was carried out by Minitab 17. Results: Mean ND titers were significantly higher in chloroform assay (10.8) than ammonium sulfate extraction (3.66) (p<0.01). Moreover, unlike chloroform method, there was no correlation between antibody titers of yolk samples evaluated by HI and total protein of the sample in ammonium sulfate method. Conclusions: Chloroform extraction is more functional in regard to NDV antibody isolation and immune system evaluation than ammonium sulfate precipitation.]]>Alexander, D.J.,200019443462Miller, P.J., E.L. Decanini and C.L. Afonso,2010102635Alexander, D.J. and D.A. Senne,20082008pp: 135-141pp: 135-141Miller, P.J. and G. Koch,20132013pp: 89-107pp: 89-107Cattoli, G., L. Susta, C. Terregino and C. Brown,201123637656Da Silva, W.D. and D.V. Tambourgi,2010135173180Warr, G.W., K.E. Magor and D.A. Higgins,199516392398Bollen, L.S. and J. Hau,1996238591Schade, R., E.G. Calzado, R. Sarmiento, P.A. Chacana, J. Porankiewicz-Asplund and H.R. Terzolo,200533129154Nasiri, K., M.R. Nassiri, M. Tahmoorespur, A. Haghparast and S. Zibaee,201619271279Nasiri, K., S. Zibaee, M. Nassiri, M. Tahmoorespur and A. Haghparast,2016Escherichia coli.]]>19883889Mohammed, H.O., R. Yamamoto, T.E. Carpenter and H.B. Ortmayer,1986Mycoplasma gallisepticum and M. synoviae antibodies by enzyme-linked immunosorbent assay.]]>30398408Yeo, S., E. Nagy and P.J. Krell,200315184187Hey, C.F. and O.M.R. Westwood,20024rd Edn.,Pages: 412Pages: 412Thayer, S.G. and C.W. Beard,20082008pp: 222-224pp: 222-224Fay, M.P. and M.A Proschan,20104139Son, A.P.,199019253258Hagan, J.C., N.J. Ashton, J.M. Bradbury and K.L. Morgan,2004Mycoplasma synoviae in UK laying hens.]]>339195Meenatchisundaram, S. and A. Michael,2010Echis carinatus antivenom antibodies from immunized chicken egg yolk.]]>85055Raj, N., P. Poulose, P.S. Surya, C. Ravishankar and M. Sebastian,2009402021Yeo, S.G. and W.P. Choi,1979194551