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133 Blood units (each untie included 450 nil) were prepared from
cow in Urmia slaughterhouse and stored in 4C for 46 days. During
46 days. During 46 days haematological (Hematocrite “PCV “,
hemoglubin “Hb “, free hemoglubin “FHb”, red blood cells “RBC white blood cells “WBC “), biochemical (sodium “Na “, potassium “K “, calcium “Ca “, urea, blood pH, total plasma protein “TPP “, glucose) and enzymatic examinations (AST, LDH) carried out weekly up to 46 days. All samples were also cultured at first day and 10 days later for bacteriological test and also studied for serological test (card test). Except in 4 cases, bacteries did not growth in culture, and serological results were all negative. The results of t-test showed no differences in PCV, RBC and WBC during the 40 days of blood collections, while Hb, FHb, pH, Na, K, Ca, Urea, LDH, AST, TPP and glucose changed significantly (P<0.05) during the 46 days investigation. It is concluded that the stability of the main blood components such as PCV, RBC and WBC were the positive points of this study but changes in blood pH, Na, K and others could probably causes reactions following infusion in sick animals and, therefore, need to infuse these bloods and determine probable effects.