Scientists put the bite on donkey lice

Recent question suggests ass lice may last developing resistance to usually used treatments.

Lauren Ellse, Faith Burden in addition to Richard Wall studied the value of pyrethroid-based insecticides on a population of ass lice. They establish a high marker of pyrethroid tolerance inwards the lice tested, in addition to suggested this was probable to reverberate the evolution of resistance.

In laboratory tests, they assessed the outcome of cypermethrin* in addition to permethrin** on chewing lice (Bovicola (Werneckiella) ocellatus) collected from donkeys.

They compared its effectiveness amongst that of diazinon, an organophosphate chemical compound to which the lice were unlikely to own got been exposed previously.

Neither permethrin, nor cypermethrin, (at concentrations recommended for purpose on animals) had whatever meaning outcome on mortality of B. ocellatus, the latest number of Equine Science Update reported. Combining cypermethrin in addition to permethrin amongst piperonyl butoxide, which may elevate their activity, did non brand them whatever to a greater extent than effective.

In contrast, 0.04 per cent diazinon caused lxx per cent mortality inside 4 hours in addition to 100 per cent mortality later 24 hours exposure.

The researchers too establish that the pour-on permethrin production was poorly distributed only about the body. Twenty-four hours later routine handling of 10 donkeys amongst the production , they collected pilus tufts from the midpoint of the dorsum in addition to from the flanks. The tufts taken from the flanks were non significantly insecticidal compared amongst those taken from the midline where the permethrin was applied.

They comment that exposing lice to sub-lethal doses risks encouraging the evolution of resistance.

Another study raised the possibility of using essential in addition to non-essential oils inwards the command of biting lice.

Rose Talbert in addition to Richard Wall examined the toxicity of 6 flora essential oils to the chewing louse, Bovicola (Werneckiella) ocellatus collected from donkeys.

The 6 oils assessed were: tea-tree (Melaleuca alternifolia), lavander (Lavandula angustifolia), peppermint (Mentha piperita), eucalyptus (Eucalyptus globulus Labillardiere), clove bud (Eugenia caryophyllata) in addition to camphor (Cinnamomum camphora).

Talbert in addition to Wall establish that all oils except camphor showed high levels of toxicity. Fifty per cent mortality was achieved at concentrations below ii per cent (w/v). Concentrations of 5-10 per cent resulted inwards 100 per cent mortality. Two essential crude components: eugenol in addition to (+)-terpinen-4-ol, showed similar levels of toxicity.

They advise that these botanical products may offering environmentally in addition to toxicologically safe, choice veterinarian treatments for the command of ectoparasitic lice.

 

*DeosectTM, Pfizer Ltd., 5% (w/v) cypermethrin
**SwitchTM, VetPlus Ltd., 4% (w/v) permethrin

 

Pyrethroid tolerance inwards the chewing louse bovicola (werneckiella)ocellatus. Veterinary Parasitology.
Lauren Ellse, Faith A. Burden, Richard Wall.
Veterinary Parasitology (2012) 188, 134-139
doi:10.1016/j.vetpar.2012.03.018

Toxicity of essential in addition to non-essential oils against the chewing louse, Bovicola (Werneckiella) ocellatus
R. Talbert, R. Wall
Research inwards Veterinary Science, (2012) 93, 831–835
http://dx.doi.org/10.1016/j.rvsc.2011.11.006

Equine Science Update

 

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