the effect of tick infestation on reproductive success of mammals was studied by using rabbits bred after they had served as hosts for dermacentor variabilis . mating success , pregnancy incidence , litter size and neonatal viability were reduced in tick-exposed rabbits , and the proportional number of abnormalities found in preimplantation-stage embryos was much higher than in unexposed controls .
C0035150
reproductive
C0032961
pregnancy