Ethiopian Veterinary Journal

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Preliminary survey on tsetse flies and trypanosomosis at grazing fields and villages in and around the Nech Sar National Park, Southern Ethiopia

G Zeleke


Preliminary survey on tsetse flies and trypanosomosis were conducted between July and August 2007 at grazing fields and villages in and around the Nech Sar national park, with the ultimate intention of forwarding baseline information on
the extent of the problem and possible control strategies. . Entomological (Tsetse flies) survey was conducted by deploying a total of 16 geo referenced NGU traps on the grazing fields of cattle. Parasitological (Trypanosomosis) survey and PCV
(Packed Cell Volume) measurement were done on randomly selected 202 cattle, of the park neighboring villagers. Glossina pallidipes with mean apparent density of 11.46 ftd (flies per trap per day) were found to be the only prevailing tsetse fly
species in the study area. However, the mean apparent density of biting flies was found to be 4.54 ftd. Trypanosomosis with population mean estimated 17.33±5.30 were seen to be a serious problem of cattle in the area. Trypanosoma congolense
and T. vivax were the two dominant species encountered in the area. However statistically significant proportion of the cattle (P<0.005) were found infected with T. congolense. The overall mean PCV was 17.65±5.30%. The mean PCV of the aparsitemic and parasitemic animals were found to be statistically significantly different (P< 0.05). On the contrary, the number of cattle aparsitemic but anemic was also significant. These could be possibly due to infection by other recurrent parasites (such as haemonchosis, babesiosis and anaplasmosis), and nutritional
deficiencies,. The present study disclosed that G. pallidipes to be the principal vector of trypanosomosis in the area. Thus, an urgent intervention on control mechanisms need to be adopted before the devastating impact of tsetse flies and trypanosomosis is aggravated to the extent of unbearable economic loss.
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