Inspection of wool lots at sales as a diagnostic test for louse infestation

Ward, Michael P.; Armstrong, R. T. F.

doi:10.1016/s0304-4017(00)00229-6

Cited by 7 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The irritation caused by lice leads to scratching Moon 1998, 1999 and rubbing that could damage the skin (Asp and Tauni 1988;Heath et al 1996;Ward and Armstrong 2000) resulting in alopecia, a description similar to our observation. On histological sections, epidermal lesion such as hyperkeratosis and diffuse dermatitis characterize skin lesions caused by lice.…”

Section: Discussionsupporting

confidence: 84%

Ectoparasites are the major causes of various types of skin lesions in small ruminants in Ethiopia

Chanie

Negash

Sirak

2010

Trop Anim Health Prod

View full text Add to dashboard Cite

Ectoparasites are the major causes of skin lesions in animals. Clinical, skin scraping examination, and histopathological studies were conducted to identify and characterize skin lesions in small ruminants caused by ectoparasites. Mange mites, lice, sheep keds, and ticks were collected from the skin of affected animals for species identification. Skin biopsies were collected from affected part of the skin and fixed in 10% neutral buffered formalin for histopathology. Of 1,000 sheep and 600 goats examined, 815 (81.50%) sheep and 327 (54.5%) goats were infested with one or more types of ectoparasites. Sarcoptes scabiei var ovis, Demodex ovis, Psoroptes ovis, Bovicola ovis, Melophagus ovinus, and Amblyomma variegatum and other tick species were identified from sheep. S. scabiei var caprae, Demodex caprae, Linognathus stenopsis, and A. variegatum and other tick species were identified from goats. Gross skin lesions or defects observed on the skin include stained and ragged wool, loss of wool/hair, nodules, crusts, lichenification, and fissuring. Microscopic evaluation of H and E stained skin sections revealed lesions in the epidermal layer such as hyperkeratosis, acanthosis, and melanin inconsistency on the basal cells of the epidermis. Follicular keratosis, perifolliculitis, frunculosis, perivasculitis, and aggregates of inflammatory cells (of acute and chronic type) with fibrosis were experiential in the dermal layer of the skin. Most of the skin lesions caused by ectoparasites are overlapping. Thus, ectoparasites control program should be executed to reduce skin lesions as skins are the major export commodity of the country.

show abstract

Section: Discussionsupporting

confidence: 84%

Ectoparasites are the major causes of various types of skin lesions in small ruminants in Ethiopia

Chanie

Negash

Sirak

2010

Trop Anim Health Prod

View full text Add to dashboard Cite

show abstract

“…The short persistence of spinosad because of photodegradation (Thompson & Hutchins 1999) makes it particularly attractive to producers needing to control lice in the 6 months before shearing when other treatments may leave excessive residues in the shorn wool. Infestations this late in the wool-growing cycle can arise as a consequence of ineffective 'off-shears' (immediately after shearing) or short-wool treatments (Ward & Armstrong 2000) or contact with infested sheep. The other registered options currently available to producers in this situation are jetting (topical application) with aqueous solutions of ivermectin or diflubenzuron, or applying an alpha-cypermethrin or diflubenzuron backline.…”

Section: Discussionmentioning

confidence: 99%

Speed of action and in vitro efficacy of spinosad against sheep body lice, Bovicola ovis (Schrank) (Phthiraptera: Trichodectidae), resistant to pyrethroid, organophosphate or insect growth regulator insecticides

Levot¹

2008

Australian Journal of Entomology

View full text Add to dashboard Cite

Results of laboratory bioassays indicated that spinosad was equally effective against sheep lice populations that were susceptible to insecticides or resistant to pyrethroid, organophosphorus or insect growth regulator (IGR) insecticides. Spinosad had similar toxicity against susceptible strains of lice to that previously reported for diazinon, but lower toxicity than cypermethrin. Lethal concentrations of spinosad and diazinon caused knock down of lice within 6 h of exposure and death within 24 h. Prior to the current phasing out of diazinon as a sheep dip, most wool producers, needing to control pyrethroid-or IGR-resistant lice infestations in short-wool, would have chosen to use diazinon. Our results suggest that spinosad is an effective alternative for treatment of lice resistant to other chemical groups.

show abstract

“…This condition presumably serves as a risk factor for high transmission and thus a high prevalence rate within small ruminants in the investigated area [55]. Lice infestations in small ruminants can cause clinical manifestations in the forms of irritation through scratching, damaged skin through excessive rubbing, and ultimately alopecia [60][61][62]. Moreover, lice infestation could be responsible for general production loss and could also act as a vector for zoonotic diseases [63].…”

Section: Discussionmentioning

confidence: 99%

Ectoparasites Infestation to Small Ruminants and Practical Attitudes among Farmers toward Acaricides Treatment in Central Region of Java, Indonesia

Insyari’ati,

Hamid,

Rahayu

et al. 2024

Veterinary Sciences

View full text Add to dashboard Cite

Ectoparasite infestations are one of the major problems affecting goat and sheep farming. Disease resulting from these infestations can cause changes in physical appearance, such as severe lesions on the skin, and economic consequences in the form of significantly reduced selling prices. This study aimed to determine the prevalence of ectoparasites in the Boyolali district, Central Java, Indonesia. A total of 651 sheep and goats were surveyed in this study. The parasites were collected via skin scraping, twister, or manually from clinically infected goats and sheep in traditional farms. All of the ectoparasites collected were successfully identified. The prevalence of ectoparasites in ruminants in Boyolali was 97.8% (637/651). The species make-up was as follows: Bovicola caprae 97.8% (637/651), Linognathus africanus 39% (254/651), Haemaphysalis bispinosa 3.5% (23/651), Ctenocephalides spp. 0.2% (1/651), and Sarcoptes scabiei 5.2% (34/651). The predilection sites were in the face, ear, and leg areas, and in the axillary, dorsal, abdomen, and scrotum regions of the surveyed animals. An evaluation of farmers’ attitudes to ectoparasites was performed using a questionnaire. The findings of this study imply that animals in the investigated area are highly exposed to ectoparasite infestations. Given the importance of ectoparasites in both livestock and human communities, specifically in the health domain, more research into appropriate control strategies is necessary.

show abstract

Inspection of wool lots at sales as a diagnostic test for louse infestation

Cited by 7 publications

References 15 publications

Ectoparasites are the major causes of various types of skin lesions in small ruminants in Ethiopia

Ectoparasites are the major causes of various types of skin lesions in small ruminants in Ethiopia

Speed of action and in vitro efficacy of spinosad against sheep body lice, Bovicola ovis (Schrank) (Phthiraptera: Trichodectidae), resistant to pyrethroid, organophosphate or insect growth regulator insecticides

Ectoparasites Infestation to Small Ruminants and Practical Attitudes among Farmers toward Acaricides Treatment in Central Region of Java, Indonesia

Contact Info

Product

Resources

About