Seasonal variation of ticks on cattle in Burkina Faso.
Cattle of the Sahel Zebu peuhl breed from traditionally managed livestock herds in a representative area of north soudanese savana (with 400-900 mm of rainfall/year from May to September) located in the central land of Burkina Faso, were monitored over 12 months for tick and blood parasite. Two species of ticks were found: Amblyomma variegatum and Hyalomma marginatum rufipes. H. m. rufipes was found on cattle all year round with a highest infestation rate in June characterized by means of 10 +/- 4.72 male and 3 +/- 2.43 female ticks per animal. A variegatum appeared on cattle at the beginning of the rainy season in May and quickly reached its highest infestation rate in June with means of 36 +/- 3.67 male and 16 +/- 1.54 female ticks per animal. Thereafter, the infestation rate progressively decreased to reach almost zero in October at the end of the rainy season. There were three preferred body sites for attachment: the axilla area, the area of the scrotum or the udder and the teats depending on the sex of the animal, and the anal area. No blood parasites were found in blood smears. However, a higher prevalence rate of dermatophilosis was noticed on highly infested animals during the rainy season as well as wounds on teats leading to decreased milk production and feeding of calves. Effort should be done to fight against ticks of Amblyomma genus at the period of the year where they are most numerous. Manual removal of ticks could be practiced, making certain to completely detach all mouthparts of the ticks. Complete removal of ticks will avoid wounds and secondary bacterial infections as well as myiasis. During the period of highest prevalence, the rainy season, acaricides could be applied on animal either by dipping the animals or spraying on the predilection sites of the ticks which are the axilla, the scrotum or the udder and the teats, depending on the gender of the animal, and around the anus.
Institut de l'Environnement et des Recherches Agricoles (INERA) BP 7192 Ouagadougou, Burkina Faso.
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D000818:Animals; D002050:Burkina Faso / Q000453:epidemiology; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D005260:Female; D015994:Incidence; D008297:Male; D011891:Rain; D012621:Seasons; D013984:Tick Infestations / Q000453:epidemiology / Q000662:veterinary*; D013987:Ticks / Q000145:classification*