Annual number of generations and biology of non-parasitic phase of Rhipicephalus microplus in irrigated and non-irrigated pasture in a tropical region.

Autor: de Aquino LM; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., de Morais IML; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Salvador VF; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Trindade ASN; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Leal LLLL; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., E Sousa LJMP; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Vale FL; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Zapa DMB; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Ferreira LL; Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil., Soares VE; Universidade Brasil, Descalvado, São Paulo, Brazil., Cruz BC; Departamento de Patologia Veterinária, Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil., Borges FA; Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal do Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil., Monteiro CMO; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil; Departamento de Biociências e Tecnologia, Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil., Costa-Junior LM; Departamento de Patologia, Universidade Federal do Maranhão, São Luís, Maranhão, Brazil., Lopes WDZ; Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil; Departamento de Biociências e Tecnologia, Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil. Electronic address: wdzlopes@hotmail.com.
Jazyk: angličtina
Zdroj: Veterinary parasitology [Vet Parasitol] 2024 Jul 31; Vol. 331, pp. 110278. Date of Electronic Publication: 2024 Jul 31.
DOI: 10.1016/j.vetpar.2024.110278
Abstrakt: This study aimed to verify the number of R. microplus annual generations in irrigated and non-irrigated pastures compared to the constant ideal environment. It also sought to evaluate the biology of the non-parasitic phase of this tick for each generation in these different areas of pasture; assess the larvae population dynamics in the pasture of each tick generation, and evaluate the R. microplus population dynamics parasitizing cattle in non-irrigated pasture. In the field experiment, two sub-areas were subjected to artificial irrigation (IRRI-A and IRRI-B) with artesian water, while the other two remained non-irrigated (NIRRI-A and NIRRIG-B). When more than 75 % of the total surviving engorged females from all 90 repetitions of each area (irrigated or non-irrigated) produced mature larvae within one tick generation, two cattle were infested with approximately 10,000 R. microplus larvae from the tick colony used in this study. On the 22nd day post-infestation, a new tick generation was started by releasing these females in different areas (IRRI-B and NIRRIG-B). This procedure was repeated successively, and each year was analyzed independently. In both the non-irrigated and irrigated areas, there were five generations of R. microplus per year. It can be observed that there the number of annual generations of ticks in this region has increased when compared to 30 years ago. Under the constant ideal temperature and humidity conditions (B.O.D. chamber), R. microplus completed an average of 6.59 generations. In the environment, the longest generation was the first (July to October), while the 2nd, 3rd and 4th (December to March) were the most similar to B.O.D. conditions. Although the number of generations was the same in the different areas, the population density of R. microplus larvae was higher in the irrigated area, probably because the irrigation provided milder temperatures, higher relative humidity and lower saturation deficit values during about eight hours per day. Between the 3rd and 5th generation of ticks, there was an overlap of larvae in the pastures, belonging to different generations, and at each peak of infestation observed in cattle between these generations, there were up to 30 % of larvae from the previous generation, and consequently up to 70 % of larvae from the new generation.
Competing Interests: Declaration of Competing Interest The authors declare that they have no conflict of interest.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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