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contentInstruction to authors 1Molecular biology of Clostridium perfringens focusing on epsilon and beta toxin genes Pilehchian Langroudi, R.5Evaluation of two simple tests for detection of cryptosporidium in calveschangizi, e.21Fauna and abundance of veterinary important flies of Muscidae (Diptera) and determination of Thelaziasis vectors in cattle farms of Urmia, IranMoradi, S., Tavassoli, M.*, Naem, S., Akbarzadeh, K.29Study of drug resistance patterns of separated Clostridium perfringens from broiler in Fars provinceGhorbani-Ranjbry, A. * , Asmarian, Sh., Ghorbani-Ranjbry, N., Ghorbani-Ranjbry, Z.39Study on Shepherd Dog Dirofilariosis in Kermanshah province in 2011-2012Bohloli Oskoii, S., Sadeghi, E., Hashemian, A.H., Ghaffari Khaligh, S.47Prevalence of cryptosporidium spp. infection in dairy calves in Mashhad Asadpour, M. , Razmi, Gh.* , Mohammadi, Gh.3, Naghibi, A. 55Properties of the appendix tissue structure in rabbit influence age and sexFatahian Dehkordi, R.A., Parchami, A. 65