Effect of oxytetracycline on the developing retina of the chick embryo

In the present work fifty fresh fertile fayoumy eggs were used, 20 eggs were used as control and 30 eggs were injected with [1mg/embryo] of oxyteracycline on the 5 th day of incubation. The embryos were extracted on the 10 th, 12 th and 15 th days of incubation. Oxytetracyclines caused retatdation of grwth of the retina in 10 and 12 days treated chick embryos as evidenced by reduction of the size of the retina associated with disappearance of some layers of it the treated embryos showed signs of incomplete regeneration when examined on the 15 th day of incubation