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 content    Instruction to authors     267 Isolation and identification of Mycoplasmas causing contagious Agalactia syndrome in sheep & goats by using culture method and PCR in Ardebil province Hajizadeh, A.*, Moazeni, J.G.,  Akhlagi, F., Naserirad, A., Motarez, B.,  Soleimani S., Asadpour, M., Sekhavati, M., Ahmadinia, R., Eshagi, A.  271Comparison and evaluation of Copper, Zinc and Iron status in serum and diets of industrial and semi-industrial dairy Holstein cattle in warm and cold seasonNoaman, V.*, Rasti, M., Ranjbari, A.R., Asadian, A.    283 Survey on the amount of ash, sodium chloride and nitrite residue  in heated sausages and its comparing with national standards of IranFazlara, A.*, Zand Moghadam, A.,  Loveimi, M.,  Taheri, M.  297 Investigation of contamination to Salmonella  and Staphylococcus aureus in native and industrial hen’s eggs in Qhom areasEkhtelat, M.*, Rezvani, S.J., Safarloo, A.  309The effect of season on aerobic bacterial flora of conjunctiva in the healthy horses Araghi-Sooreh, A.*, Nadalian, M.Gh., Mokhber-Dezfuli, M.R.  315 The effect of different levels of Citric acid, Propionic acid, and Bacillus subtilis on the production of Aflatoxin from Aspergillus flavusFani Makki, O., Afzali, N., Omidi, A., Frouzanmehr, M., Mohammadi, H.R.  325Case report: Pre-eclampsia and eclampsia in five household cats Mosallanejad, B.*, Avizeh, R., Moarrabi, A., Khadjeh, Gh.  331