Autor(es):
Felippelli, Gustavo [UNESP] ; Teixeira, Weslen Fabricio Pires [UNESP] ; Gomes, Lucas Vinicius Costa [UNESP] ; Maciel, Willian Giquelin [UNESP] ; Cruz, Breno Cayeiro [UNESP] ; Buzzulini, Carolina [UNESP] ; dos Santos, Thais Rabelo ; Ferreira, Lorena Lopes ; Soares, Vando Edésio ; Rodrigues, Daniel Castro ; Monteiro, Caio Márcio de Oliveira ; da Costa, Alvimar José [UNESP] ; Lopes, Welber Daniel Zanetti
Data: 2022
Identificador Persistente: http://hdl.handle.net/11449/223278
Origem: Oasisbr
Assunto(s): Aspersion bath; Cattle tick; Chemical control; Spray acaricide; Tick burden
Descrição
Made available in DSpace on 2022-04-28T19:49:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-03-01
Due to the scarcity of information regarding the control of Rhipicephalus microplus on bovines with different tick burdens, tick counts and the efficacy of a commercial spray formulation (aspersion bath with organophosphate + pyrethroid) were evaluated for animals with a low and high tick burdens for 35 days in a stall test. Thirty-two crossbreed Bos taurus indicus x Bos t. taurus experimentally infested with R. microplus larvae were divided into four groups: T01 high infestation control, T02 high infestation treated, T03 low infestation control, and T04 low infestation treated. The bovines were kept individually in pens and R. microplus females were collected daily. All data were statistically analyzed with a significance level of 5% (P ≤ 0.05). For linear regressions, variables with P≤0.05 and the highest coefficients of determination (R2 ≥ 0.70) were considered the best descriptors. The reliability level was 95%. Tick counts differed (P<0.0001) between T01 and T02 (high infestation control vs. treated), except at day 2 (P >0.05) post-treatment, and efficacy ranged from 85.2 to 50.6%. The number of collected engorged females was lower (P<0.0001) for T04 than for T03 (low infestation treated vs. control) animals from day 3 to 29, and efficacy ranged from 95.2 to 69.8%. In addition, tick burden and efficacy were negatively correlated for both the group of animals with a high tick burden (r = -0.5256; p = 0.0012; R² = 0.2762) and the group of animals with a low tick burden (r = -0.9817; p < 0.0001; R² = 0.9638). In conclusion, a high tick burden on bovines decreases the efficacy of the tested spray acaricide.
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Departamento de Medicina Veterinária Preventiva Escola de Veterinária Universidade Federal de Minas Gerais
Universidade Brasil
Centro de Parasitologia Veterinária Escola de Veterinária e Zootecnia Universidade Federal de Goiás
Departamento de Biociências e Tecnologia Instituto de Patologia Tropical e Saúde Pública Universidade Federal de Goiás
Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista
