At this study, 8 groups of 14 days-old 14 birds were infected respectively with 25x10(3), 50x10(3), 100x10(3), 200x10(3), 350x10(3), 500x10(3), 750x10(3) and 1000x10(3) Eimeria spp oocysts and 9th group was determined as control. The inoculum consist of different types of field oocysts. Clinical findings of groups were registered in sequent period. Necropsical examinations were applied to the birds choosen at the days of 10th and 30th of the inoculation and also dead ones. The data of macroscopic changes and lenghts of gut parts were recorded. For the purpose of determining live weight changes, all of the birds were weighted at 0, 5th, 10th, 15th, 20th, 25th and 30th day of the infection. Although the data shows a relationship between the dose of infection, clinical findings, gut changes and live weight changes but it also shows that relationship isn't arithmetical and/or may be under control of lots of factors.