BOOPHILUS-MICROPLUS (ACARINA . IXODIDAE) . EXPERIMENTAL INFESTATIONS ON CATTLE RESTRAINED FROM GROOMING

Resistant and susceptible cattle were infested daily with a constant number of larvae of the ixodid tick, Boophilus microplus, for a period of 13-18 weeks and restrained from self-grooming over part of the period. Tick yield increased dramatically on resistant animals from the third to the fifth week of restraint, then decreased sharply although the animals were still restricted from self-grooming. The increase in tick yield was related to the initial resistance of the animal, the most resistant showing the highest increase. © 1969.