This report was described generalized amyloidosis in a male gazelle, 1.5 years old. In necropsy, hyperaemia on all the serosal surfaces in abdomen, a hemorrhagic ulcer, 7 cm in diameter, on mucosa of rumen, and whitish colored foci, 1-2 mm diameter, on the surfaces of both kidneys were present. Microscopically, there were homogenous pink depositions in the glomeruli, intertubular interstitium, tubular basement membranes and walls of blood vessel in kidney, lymphoid follicles in spleen, space of Disse in liver and lamina propria of the small intestine. These deposits were seen brick-red color stained with Congo red on tissue sections, but these were not stained with Congo red after treated with potassium permanganate. For this reason, AA (secondary) amyloidosis was evaluated. When stock tissue samples stored in 10% formalin were treated with Lugol and acid sulphuric, amyloid depositions were seen as dark blue. Generalized reactive amyloidosis with ulceration in the rumen was diagnosed. Amyloid deposits in the tissues are not only fresh tissue but also tissue stored formalin can be determined as a macroscopic.