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Preliminary Study on Artificial versus Animal-Based Feeding Systems for <i>Amblyomma</i> Ticks (Acari: Ixodidae)
oleh: Patrick Stephan Sebastian, Nina Król, María Belén Novoa, Ard Menzo Nijhof, Martin Pfeffer, Santiago Nava, Anna Obiegala
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-04-01 |
Deskripsi
Hard ticks pose a threat to animal and human health. Active life stages need to feed on a vertebrate host in order to complete their life cycle. To study processes such as tick-pathogen interactions or drug efficacy and pharmacokinetics, it is necessary to maintain tick colonies under defined laboratory conditions, typically using laboratory animals. The aim of this study was to test a membrane-based artificial feeding system (AFS) applicable for <i>Amblyomma</i> ticks using <i>Amblyomma tonelliae</i> as a biological model. Adult ticks from a laboratory colony were fed in a membrane-based AFS. For comparison, other <i>A. tonelliae</i> adults were fed on calf and rabbit. The proportions of attached (AFS: 76%; calf/rabbit: 100%) and engorged females (AFS: 47.4%; calf/rabbit: 100%) in the AFS were significantly lower compared to animal-based feeding (<i>p</i> = 0.0265). The engorgement weight of in vitro fed ticks (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 658 mg; SD ± 259.80) did not significantly differ from that of ticks fed on animals (<i>p</i> = 0.3272, respectively 0.0947). The proportion of females that oviposited was 100% for all three feeding methods. However, the incubation period of eggs (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 54 days; SD ± 7) was longer in the AFS compared to conventional animal-based feeding (<i>p</i> = 0.0014); <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 45 days; SD ± 2 in the rabbit and (<i>p</i> = 0.0144). <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 48 days; SD ± 2 in the calf). Egg cluster hatching (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 41%; SD ± 44.82) was lower in the AFS than in the other feeding methods (rabbit: <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 74%; SD ± 20; <i>p</i> = 0.0529; calf: <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi mathvariant="italic">x</mi><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> = 81%; SD ± 22; <i>p</i> = 0.0256). Although the attachment, development, and the hatching of AFS ticks were below those from animal-based feeding, the method may be useful in future experiments. Nevertheless, further experiments with a higher number of tick specimens (including immature life stages) and different attractant stimuli are required to confirm the preliminary results of this study and to evaluate the applicability of AFS for <i>Amblyomma</i> ticks as an alternative to animal-based feeding methods.