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The authors studied the impact of tropical theileriosis onset on milk yield decrease in 10 local bred cows in Skikda (North Algeria) during 2015 summer season. The milk yield decrease estimated weekly during two months was 2.76 L/day/cow corresponding to 31.92%of the total milk yield. This decrease corresponds to 110.5 Algerian Dinars (1.02 US$)/day/diseased cow. The relative variation of milk yield showed a dramatic decrease from 82.72% to 0.76% at Day 21 then became constant. Further studies are needed to improve these estimations of financial losses due to bovine tropical theileriosis in Algeria.