Pathogenesis of Ovine Foot‐rot: The Role of Some Environmental Factors

Graham, N. P. H.; Egerton, J. R.

doi:10.1111/j.1751-0813.1968.tb09092.x

Cited by 88 publications

(70 citation statements)

References 4 publications

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“…That, coupled with manure accumulation, contamination of bedding and insufficient disinfection inside the barn during winter months would result in compromised hygiene, which favours proliferation and transmission of pathogens, such as Dichelobacter nodosus and Fusobacterium necrophorum. Such conditions are considered to be prime risk factor for development of foot-rot (Abbott and Lewis, 2005;Green and George, 2008;Sargison, 2008) and provide an explanation regarding seasonality of the increased risk for lameness development during winter months, which has been previously reported by other researchers (Graham and Egerton, 1968;Eze, 2002).…”

Section: Discussionmentioning

confidence: 75%

Clinical characteristics of lameness and potential risk factors in intensive and semi-intensive dairy sheep flocks in Greece

Oikonomou

Arsenos

2017

J Hellenic Vet Med Soc

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Objectives of the study were to present descriptive epidemiological characteristics of lameness in intensively and semi-intensively reared flocks of Chios-breed dairy sheep in Greece, as well as to identify potential factors that may affect development, severity and duration of the disorder. In total, 1618 ewes in nine flocks were used for assessment of locomotion score and detailed clinical examination, which were performed fortnightly throughout a milking period. Subsequently, two logistic regression models were employed to assess impact of various variables on occurrence and severity of lameness. Mean lameness incidence in the nine flocks under surveillance during the milking period was 6.8% (110 cases in 1618 ewes); between flocks range of the incidence was 0.4%-22.0%. In 48% of the cases, lameness was considered to be severe. Foot-rot was found to be the commonest lameness-causing disorder, accounting for 66% of all cases. During the investigation, incidence of lameness in relation to the causing factor was 4.5% for foot-rot, 1% for white line abscesses, 1% for white line disease, <0.5% for pedal joint abscesses and <0.5% for hoof injuries. Farm size, stocking density, parity of the ewes and lambing season were identified as significant risk factors for dairy sheep lameness occurrence. Finally, stocking density was also found to affect lameness severity.

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Section: Discussionmentioning

confidence: 75%

Clinical characteristics of lameness and potential risk factors in intensive and semi-intensive dairy sheep flocks in Greece

Oikonomou

Arsenos

2017

J Hellenic Vet Med Soc

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“…Such conditions are also favorable for the occurrence of foot rot and white line disease. The moisture causes devitalization of the interdigital space allowing infection by Fusobacterium necrophorum and Dichelobacter nodosus (Graham & Egerton 1968). Additionally, the feet are more susceptible to injury when the animals walk in areas with stones and scrub vegetation, which cause traumatic injuries, including sole ulcers, granuloma and white line disease.…”

Section: Discussionmentioning

confidence: 99%

“…The occurrence of benign or virulent forms depend on three factors: virulence of the agent; environmental conditions favorable for transmission; and host resistance (Graham & Egerton 1968). The lower frequency of foot rot in goats than in sheep, as well as the smallest number of animals with virulent forms, represents the higher resistance of goats compared to sheep.…”

Section: Discussionmentioning

confidence: 99%

Foot rot and other foot diseases of goat and sheep in the semiarid region of northeastern Brazil

et al. 2011

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This paper reports the occurrence and epidemiology of outbreaks of foot rot and other foot diseases in goats and sheep in the semiarid region of Paraíba, northeastern Brazil. Four farms were inspected for the presence of foot lesion in sheep and goats and for environmental conditions, general hygiene, pastures, and disease control measures. The prevalence of foot lesions was 19.41% (170/876) in sheep and 17.99% (52/289) in goats, ranging between 5.77% and 33.85% in different farms. Foot rot was the most common disease, affecting 12.1% of the animals examined (141/1165), but with signiϐicantly higher (p<0.05) prevalence in sheep (13.69%) than in goats (7.27%). The frequency of malignant foot rot was also signiϐicantly lower (p<0.05) in goats (9.53%) than in the sheep (40.83%). On one farm, Dorper sheep showed signiϐicantly higher (p<0.05) prevalence of foot rot (17.5%) than Santa Inês sheep (6.79%), and the number of digits affected was also higher in the former. Dichelobacter nodosus and Fusobacterium necrophorum were isolated from cases of foot rot. White line disease was found in 3.95% of the animals, sole ulcers in 1.29%, foot abscess in 1.03% and hoof overgrowth in 0.5%. The high rainfall at the time of occurrence, grazing in wetlands, clay soils with poor drainage, presence of numerous stony grounds, closure of the ϐlocks in pens at night, and introduction of affected animals were considered predisposing factors for the occurrence of foot diseases.INDEX TERMS: Foot lesions, foot rot, foot abscess, small ruminants. RESUMO.-[Pododermatite infecciosa e outras doenças podais de caprinos e ovinos no semiárido Nordestino.]Este trabalho relata a ocorrência e aspectos epidemiológi-cos de surtos de pododermatite infecciosa e outras afecções podais em caprinos e ovinos no semiárido paraibano. As propriedades foram inspecionadas quanto à presença de problemas podais e aspectos relacionados às condições ambientais, higiene, locais de pastejo e medidas de controle utilizadas. Nos ovinos a prevalência de lesões podais foi de 19,41% (170/876) e nos caprinos de 17,99% (52/289), variando entre 5,77% e 33,85% nas diferentes propriedades. A pododermatite infecciosa foi a doença mais frequente acometendo 12,1% dos animais examinados (141/1165), sendo a prevalência nos ovinos (13,69%) signiϐicativamente maior (p<0,05) do que a nos caprinos (7,27%). A frequência de lesões malignas desta doença em caprinos (9,53%) foi, também, signiϐicativamente menor (p<0,05) do que nos ovinos (40,83%). Em uma das propriedades a prevalência de pododermatite infecciosa entre os ovinos Dorper (17,5%) foi signiϐicativamente maior do que a nos ovinos da raça Santa Inês (6,79 %), tendo os animais da primeira raça maior número de membros acometidos pela pododermatite infecciosa. Dichelobacter nodosus e Fusobacterium necrophorum foram isolados de casos de pododermatite infecciosa. A doença da linha branca foi constatada em 3,95% dos animais, a úlcera de sola em 1,29%, o

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“…First, the principles of footrot control are poorly understood; most work should be performed in late summer so that climatic influences will not aid in the spread of infection. Second, most footrot encountered in winter is most likely to be the result of persistence of infection in chronically infected sheep from autumn, as it has been shown that transmission does not occur if the mean daHy temperature is below 10 0 C. (2) • The farm labour shortage has practical implications for effective footrot treatment. Treatment work is labour intensive and requires considerable skill.…”

Section: Discussionmentioning

confidence: 99%