Transmiss？o transovariana de Babesia bovis em Boophilus microplus: obten？？o de cepa de carrapato livre de Babesia spp.

in this experiment part of the life cycle of babesia bovis in its invertebrate host, the tick boophilus microplus was studied. in order to evaluate the capacity of infection and transmission of b. bovis were collected semi-engorged females of b. microplus fed on carrier and ill bovines. in the 18th day after infestation, semi-engorged females were collected directly from bovine bodies and after 21st day engorged females dropped on the ground. all the collected groups were incubated at 27°c and relative humidity greater than 70%. at the 5th day of oviposition the diagnosis was made by direct examination of haemolymph smears. the biological test reveled that b. bovis transovarial transmission doesn't happer in semi-engorged females. the results offer a simple techique to obtain strains of ticks free of b. bovis.