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Abstract

Psoroptes ovis surviving on cattle that were injected subcutaneously with ivermectin were capable of infesting unprotected cattle 3, 5, 7 and 9 days after the injection. All recipient cattle exposed to mites from carrier-injected cattle at 3 and 5 days after injection developed reproductive...

Author(s)
Wright, F. C.; Guillot, F. S.
Citation
American Journal of Veterinary Research, 1984, 45, 2, pp 228-229
Abstract

The serum antibody activity to Psoroptes ovis antigens, as determined by enzyme-linked immunosorbent assay (ELISA), was monitored during the development and decline phase of infestation in cattle herds under feedlot conditions in an endemic (Bushland) and a non-endemic (Kerrville) area of Texas....

Author(s)
Fisher, W. F.; Guillot, F. S.; Cole, N. A.
Citation
Experimental & Applied Acarology, 1986, 2, 3, pp 239-248
Abstract

Hereford heifer calves were experimentally infested with Psoroptes ovis. Histological examination of skin specimens was conducted at weekly intervals before and after treatment with ivermectin on postinfestation week 7. Electron microscopy revealed numerous degranulating mast cells in the skin of...

Author(s)
Stromberg, P. C.; Guillot, F. S.
Citation
American Journal of Veterinary Research, 1989, 50, 4, pp 594-601
Abstract

Cattle were artificially infested with Psoroptes ovis to evaluate their susceptibility and to document the development of psoroptic mange in the south-eastern costal plain of Georgia, an area outside the normal distribution of this ectoparasite. Sixteen Hereford heifer calves were purchased at a...

Author(s)
French, F. E.; Callcott, A. M. A.; Guillot, F. S.
Citation
Journal of Agricultural Entomology, 1988, 5, 1, pp 69-74
Abstract

A test was begun in November 1982 to evaluate the development of Psoroptes ovis, the severity of psoroptic mange of cattle and the incidence of transfer of P. ovis from artificially infested cattle (about 1000 mites/2 animals) to uninfested cattle kept in feed lots in either an endemic or a...

Author(s)
Guillot, F. S.; Cole, N. A.
Citation
Veterinary Parasitology, 1984, 16, 1/2, pp 127-135
Abstract

Moxidectin, a macrocyclic lactone endectocide (derived from the actinomycete Streptomyces cyaneogriseus noncyanogenus), was evaluated for its efficacy against the migrating 1st-instar larvae of H. lineatum and against nematode (trichostrongyles, Nematodirus and Trichuris spp.) egg production in...

Author(s)
Scholl, P. J.; Guillot, F. S.; Wang, G. T.
Citation
Veterinary Parasitology, 1992, 41, 3-4, pp 203-209
Abstract

Six Hereford heifer calves were infested with 500 Psoroptes ovis and compared to 6 uninfested controls. Infested calves developed severe exudative dermatitis which covered 100% of the body surface by 7 weeks after infestation. They developed moderate nonregenerative anaemia, decreased neutrophils...

Author(s)
Stromberg, P. C.; Guillot, F. S.
Citation
Veterinary Pathology, 1987, 24, 5, pp 365-370
Abstract

Six Hereford calves were infested with 500 Psoroptes ovis. Haemograms were examined weekly for 7 weeks during progressively extensive dermatitis and compared to 6 uninfested control calves. Calves were treated with ivermectin 600µg/kg i/m and weekly haemograms were compared for 4 weeks during...

Author(s)
Stromberg, P. C.; Guillot, F. S.
Citation
Veterinary Pathology, 1987, 24, 5, pp 371-377
Abstract

In studies in Texas in 1978-80, Hereford cattle with a history of psoroptic scabies, which is caused by Psoroptes ovis (Her.), were as susceptible after re-exposure to P. ovis as cattle exposed for the first time. The first re-exposure of cattle to P. ovis after a 5-month latency period failed to...

Author(s)
Guillot, F. S.
Citation
Journal of Economic Entomology, 1981, 74, 6, pp 653-657
Abstract

When ivermectin was injected intramuscularly into cattle at a rate of 200 mu g/kg body weight in studies in the USA, infestations with Psoroptes ovis (Her.) were completely eliminated within 2 weeks of treatment. However, mites surviving 1, 3 and 5 days after treatment were viable and infective...

Author(s)
Guillot, F. S.; Meleney, W. P.
Citation
Veterinary Parasitology, 1982, 10, 1, pp 73-78

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