1240 bulls were examined for the detection of Trichomonas foetus in ll districts of Sharkya Governorate during the summer time of the years 1965 till 1978. Out of 659 buffaloe bulls, 569 Priezian bulls and 12 non-governmental native breed bulls; it is found that all native breed bulls examined were negative, while three Buffaloe bulls and 26 Friezian bulls were positive. The highest percentage of infec tion was 22.24 at the year 1967 among the Friezian bulls. All breeds of bulls are considered negative till end of this work. Regarding the rate of infection in the 11 districts, Menia El Camh and Belbes were found to present the highest number of infected bulls. On the other hand Pakoose was free of infection all over the years.