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A study of the seasonal incidence of the strongyles of the bovine digestive tract, under natural climatic conditions (rainfall, humidity and temperature) and the use of Morantel Tartrate (Exhelm II, Pfizer, France) for its control was conducted, in the North of the Ivory Coast during 1976-1977. Young calves belonging to the local breeds Baoulé, N'Dama, and cross bred Zebus-taurins employed for this study were located in the East, West, North and Centre of the Korhogo area. On the basis of the results obtained it could be concluded that: the infestation rate calculated on the basis of egg output, increases during the rainy season, between April and October and decreases during the dry season namely between November and March/April; the animals treated twice or three times with Exhelm II expelled considerably less E.P.G., in comparison to that of the control group. It is suggested that this drug may be used at the dosage rate of 7,5 mg per kg live body weight under field condition at least twice in a year, at the beginning and at the end of the rainy season. A third treatment using this same anthelmintic during the rainy season does not seem to be more profitable than two treatments. As such this third treatment should not however be considered as being essential. N'Dama and Baoule of that region have mixt infection of strongyles comprising of Trichchostrongylus 38%, Oesophastomum 30%, Cooperia 17%, Bunostomum 16%, Haemonchus 15%, Hematodirus 2% and Ostertagia 0,2%.

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