Comparação dos métodos de controles estratégico e seletivo na carga parasitária de Rhipicephalus microplus em rebanhos bovinos leiteiros
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2020-03-02
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Universidade Federal de Goiás
Resumo
Rhipicephalus microplus is one of the main ectoparasites of economic importance for cattle in
tropical and subtropical regions, causing drop in milk production and transmitting pathogenic
agents such as Anaplasma and Babesia. Therefore, constant studies on treatment schemes for
parasite control are necessary to minimize the damage and losses that follow infestations by this
arthropod. In this way, the present study aimed to compare two methods for R. microplus control,
the strategic method and the selective method, in dairy cattle herds, aiming to provide support to
the technical guidelines on the most efficient control method of the parasitic load. In the strategic
method, seven treatments with spray acaricides were carried out every 21 days, starting in
November. In the selective method, treatments with acaricides were performed only on animals
that had an infestation equal to or greater than 40 engorged females. Only 5% of animals submitted
to the selective method received treatment in November. The average of tick counts was lower in
the strategic method compared to the selective method, in December. The maximum peak of
infestation occurred in January, in both control methods, with no significant difference, persisting
until February. No animal of the strategic method had an infestation greater than 40 engorged
females in March. However, the parasitic load in both control methods was similar in the second
evaluation in March. The averages of counts in the strategic method were lower in the months of
April (10.9) and May (16.9) compared to the averages observed in the selective method (56.3 and
48.4). Yet, it was necessary to carry out tactical treatments in the strategic method, after the
treatment scheme, in up to 16.7% of the animals in April and up to 50.0% in May, while in the
selective method, the treatments varied from 42.8 to 88.8% in April and in May it varied from 28.6
to 75.0%. The total count of R. microplus was 5,036 engorged females in the strategic method,
while in the selective method there were 13,829 engorged females in the study period. Therefore,
it is concluded that the treatment scheme for control of R. microplus significantly interfered in the
parasitic load of dairy cows, favouring the maintenance of acceptable levels of parasitism when the
strategic method of tick control was implemented compared to the adoption of the selective
method.
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VIEIRA, L. S. Comparação dos métodos de controles estratégico e seletivo na carga parasitária de Rhipicephalus microplus em rebanhos bovinos leiteiros. 2020. 52 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2020.