Results
According to the analysis of the average counts and
efficiency of treatment, as shown in Table 1, there was no
significant difference between the four groups, regarding
counts on day 1. As from day 3, the products started to
show an influence on the counts, when compared to the
control (untreated) group. This effect persisted until day
28, with the treated groups showing statistically significant
differences compared with the control group, with the
sole exception of abamectin on day 14.
All groups treated showed efficiency throughout the
duration of the experiment, with an advantage for the
doramectin group which had the lowest average count
(6.15 ticks per animal), being statistically different from
the others (p < 0.01), and also having the greatest average
efficiency (85.92%), considering the period between day 3
and day 28 after treatment. In this case the action of the
active ingredients in fighting ticks became evident. All
these products showed a residual effect lasting 7 days,
against reinfestation with larvae.
The analysis of the oviposition of B. microplus collected
after the treatment (Table 2) shows the action of all these