Control of Ovine Cutaneous Actinomycosis

Roberts, D. S.; Graham, N. P. H.

doi:10.1111/j.1751-0813.1966.tb04673.x

Cited by 25 publications

(6 citation statements)

References 8 publications

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“…It has been suggested by Roberts (1963b and c) and Roberts and Graham (1966) that flies or other insect vectors might be responsible for the transfer of zoospores from sheep to sheep. The experiments reported here have shown that transfer can readily occur by contact between infected and susceptible wet sheep.…”

Section: Discussionmentioning

confidence: 99%

“…Observations in the field have suggested an association between dipping or showering sheep and subsequent outbreaks of dermatophilosis (Seddon 1929, Moule 1952, Austwick and Davies 1958, Graham 1964, Roberts and Graham 1966. Le Riche ( 1 967) showed experimentally that suscep-Mild Very severe Very severe Severe Nil tible sheep could be infected by dipping fluids contaminated with D. congolensis culture.…”

Section: Discussionmentioning

confidence: 99%

“…A review of the disease in sheep by Roberts and Graham ( 1966) listed the factors necessary for the production of the disease as ( I ) some active lesion as a source of zoospores, (2) wetting of the lesion to permit release of the zoospores, (3) a mechanical means of transfer to other sheep (possibly flies or other insect vectors), and (4) sheep with susceptible woolled skin. The transmission of zoospores by flies has been shown to occur by Richards and Pier (1966) in experiments with rabbits.…”

Section: Introductionmentioning

confidence: 99%

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The Transmission of Dermatophilosis (Mycotic Dermatitis) in Sheep

Riche

1968

Aust Veterinary J

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Transmission of Dermatophilosis (Mycotic Dermatitis) in Sheep

Riche

1968

Aust Veterinary J

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“…Management of lumpy wool on sheep is currently achieved by avoiding close-contact wetting events, removal and culling of chronically affected sheep and the use of more resistant sheep (Edwards 1991;Roberts and Graham 1966) infection; however, these practices have now largely been replaced by technologies that avoid the wetting of sheep. Management also includes the monitoring of spontaneous self-healing or, in the case of severe chronic infections, the use of intramuscular injection of sheep with long-lasting antibiotics (Berry and Watt 2017).…”

Section: Current Management Of Dermatophilosismentioning

confidence: 99%

Dermatophilosis (lumpy wool) in sheep: a review of pathogenesis, aetiology, resistance and vaccines

et al. 2021

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Lumpy wool (dermatophilosis) develops following prolonged wetting of sheep when bacterial proliferation in wool and on skin induce an exudative dermatitis, causing a superficial skin lesion and damage to wool follicles and fibres. The incidence of dermatophilosis is strongly dependent on wet and warm weather and, hence, infection is sporadic. While older animals are less at risk than are lambs, it is unclear whether this reflects naturally acquired immune resistance or the maturation of skin and wool fibres. Dermatophilosis directly causes wool production losses and it also is a risk factor for blowfly strike, which has a substantial economic impact and increasing challenges associated with current control procedures. This review assessed research on the bacterial causes of lumpy wool, the characteristics of the resulting immune defence reactions in sheep, current control strategies, and limitations of previous attempts to control lumpy wool by sheep vaccination.

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“…Ovine dermatophilosis occurs worldwide (Stewart 1972) and a range of environmental and sheep management factors are thought to be associated with its occurrence and severity (Roberts and Graham 1966). Apart from some studies on the effects of dipping (Le Riche 1967; Wilkinson 1979) there is little published evidence describing associations between dermatophilosis and management practices.…”

Section: Introductionmentioning

confidence: 99%

A survey of ovine dermatophilosis in Western Australia

Edwards¹,

Gardner²,

Rt³

et al. 1985

Aust Veterinary J

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A random sample of 200 Merino sheep owners was interviewed by telephone during April 1983 and asked questions relating to the prevalence of ovine dermatophilosis in their flocks, methods used for prevention and treatment of dermatophilosis, management strategies employed and the location and annual rainfall of each farm. The response rate was 99.5%. During the previous 12 months 62.3% of farmers had observed dermatophilosis in their flocks. The prevalence within flocks was highest in hoggets (mean 2.2%, range 0 to 75%) followed by lambs (mean 0.8%, range 0 to 25%), ewes (mean 0.6%, range 0 to 20%) and wethers (0.2%, range 0 to 20%). The mean weight of wool identified as affected by dermatophilosis was 58 kg (range 0 to 882 kg). Preventive measures were used on 57% of farms and the most common methods were changes in dipping practice (23.6%) and culling of affected sheep (21%). An average of 13.7 sheep per farm were culled for dermatophilosis and of these, 82% were sold and the remainder (18%) were killed on the farm. Antibiotics, of which most were combinations of penicillin and streptomycin were used to treat dermatophilosis on 8.5% of farms and treatments other than antibiotics were used on 10% of farms. The prevalence of dermatophilosis and its relationship to various environmental and management factors varied with the age and sex of sheep. Discriminant analysis indicated that of the factors studied, average annual rainfall, month of lambing, average fibre diameter and the month ewes were shorn were related to the prevalence of dermatophilosis in lambs.(ABSTRACT TRUNCATED AT 250 WORDS)

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Control of Ovine Cutaneous Actinomycosis

Cited by 25 publications

References 8 publications

The Transmission of Dermatophilosis (Mycotic Dermatitis) in Sheep

The Transmission of Dermatophilosis (Mycotic Dermatitis) in Sheep

Dermatophilosis (lumpy wool) in sheep: a review of pathogenesis, aetiology, resistance and vaccines

A survey of ovine dermatophilosis in Western Australia

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