Drop-off rhythms and survival of (Acari: Ixodidae) fed on crossbred (Friesians x Zebu) calves in Sudan.

is one of the most economically important ticks in the Sudan It is the main vector of tropical theileriosis in cattle and other diseases in different species. The study aims to investigate the drop-off rhythms and survival periods of tick stages fed on crossbred calves. Larvae, nymphs and adults fed on crossbred calves (male, 3-6 months old, Friesians x Zebu) kept under zero grazing system.