FREQUENCE OF FLIES WITH VETERINARY IMPORTANCE AT THE ZOOLOGICAL GARDEN OF THE FEDERAL UNIVERSITY OF MATO GROSSO (UFMT)/BRAZIL. From january until december 1996 were used three Wind Oriented Traps (WOT) with different baits: banana, feces and fish. The traps have been installed in different places in the zoological garden. The inspection of the WOT was made at every 72 hours. The flies collected were classified, using the key proposed by James (1964). During the experiment period 3563 diptera have been captured, that is 90,18% (3213) classified as Calliphoridae, Muscidae and Sarcophagidae, and 9,82% (350) don´t classified. The WOT, who captured the major number of flies, was the one baited with fish. The genera Chrysomyia was prevalent over any other genera during all the year, with major number (852 specimens) captured in september. The genera Sarcophaga presented greater number captured in july (201 specimens) . From january until march Chrysomyia prefered the banana baited trap.