Contagious Respiratory Tumours

Sharp, JM; Heras, M. De las

doi:10.1002/9780470753316.ch30

Cited by 14 publications

(31 citation statements)

References 17 publications

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“…An important differentiating feature from maedi can be observed if the pelvic limbs are raised; thin, mucoid fluid produced by the neoplastic cells in the lungs pours from the nostrils of some of the animals with pulmonary adenomatosis. This clinical aspect of OPA is named the wheel-barrow test (Kycko et al 2008;Sharp & De las Heras 2000). In the absence of excessive lung fluid, a post-mortem examination is the best way to make a diagnosis, particularly in the absence of a reliable serological test for detecting OPA in live animals (Ortin et al 1998;Summers et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Ovine pulmonary adenocarcinoma in slaughtered sheep: A pathological and polymerase chain reaction study

Azizi¹,

Tajbakhsh²,

Fathi³

2014

J S Afr Vet Assoc

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Ovine pulmonary adenocarcinoma (OPA) is a contagious tumour in sheep caused by jaagsiekte sheep retrovirus (JSRV). This tumour originates from the pneumocyte type II and Clara cells and grossly appears as hard, prominent nodules in different lobes. The clinical signs of the disease are similar to those of other chronic respiratory diseases and are not pathogonomic. Therefore, post mortem examinations and histopathological studies are the most reliable ways to diagnose OPA, particularly subclinical cases of this neoplasm. In this study, out of 1000 sheep lungs grossly inspected, 50 animals were suspected of OPA. The suspected lungs as well as 25 apparently normal lungs were examined by histopathological and PCR methods. The proviral DNA was detected in 1/25 apparently normal lungs and 8/50 of the suspected lungs and subsequently confirmed by histopathological studies. The PCR-positive lung samples from five sheep revealed lesions of 'atypical' OPA and those from three sheep showed the 'classic' form of the disease. The tumours were multifocal and the masses were distributed throughout the cranioventral and diaphragmatic lung lobes. The stroma of the tumours in the atypical cases was more severely affected with inflammatory cell infiltration and connective tissue proliferation. The histopathological characteristics of maedi including hyperplasia of the perivascular and peribronchiolar lymphoid cells, interstitial lymphoplasmacytic infiltration and smooth muscle hyperplasia were also associated with OPA, especially the atypical form of this adenocarcinoma. Atypical OPA was more prevalent than the classic form. Geographic and climatic conditions, duration of exposure to the virus and the immune status of individual animals might be responsible for the differences between the two pathological entities of OPA.

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Section: Discussionmentioning

confidence: 99%

Ovine pulmonary adenocarcinoma in slaughtered sheep: A pathological and polymerase chain reaction study

Azizi¹,

Tajbakhsh²,

Fathi³

2014

J S Afr Vet Assoc

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“…Sheep pulmonary adenomatosis can cause a long insidious disease leading to slow deterioration and death of the animals (Sharp and De Las Heras, 2007). Maedi-visna is another viral disease characterised by long incubation leading to pneumonia and death (Pritchard and McConnell, 2007).…”

Section: Good Healthmentioning

confidence: 99%

Scientific Opinion on the welfare risks related to the farming of sheep for wool, meat and milk production

2014

EFS2

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This scientific opinion is the outcome of a scoping exercise aimed to identify the main welfare consequences and associated risk factors for sheep across, and within, categories of management systems and production types. The exercise included the construction of a risk (conceptual) model, a literature review and an expert knowledge elicitation, involving an online survey and a technical hearing, in order to rank the welfare consequences on the basis of the amount of suffering and prevalence. Sheep farmed for wool, meat and milk production were the target population, focusing on ewes and lambs. Based on the degree of human contact, use of housing, nature of pasture management and provision of supplementary feeding, sheep management systems were characterised as: shepherding, intensive, semi-intensive, semi-extensive, extensive, very extensive and mixed. The conceptual model proposed seventeen welfare consequences. In ewes, the importance of the welfare consequences was rated differently in different management systems; however, across all systems, the most important welfare consequences were: thermal stress, lameness and mastitis. Prolonged hunger was rated to be more frequent in extensive and very extensive management systems, and mastitis in ewes reared for milk production. For lambs, there were few differences among management systems with thermal stress, pain due to management procedures, gastro-enteric disorders and neonatal disorders rated as main welfare consequences. Respiratory disorders were more frequent in intensive management systems. The technical hearing of experts facilitated consensus on the major risk factors for ewes and lambs. Animal-based measures exist for most welfare consequences in ewes and lambs, but many require further validation. The identified currently available validated ABMs for assessing the main welfare consequences in ewes are: body condition score, locomotion score, udder consistency and somatic cell count in milk; and in lambs: shivering, evidence of painful husbandry procedures and dag score (score of breech soiling). for the support provided to this scientific opinion. The welfare of sheep EFSA Journal 2014;12(12):3933 2 SUMMARYFollowing a request from the European Commission, the EFSA Animal Health and Welfare (AHAW) Panel was asked to deliver a scientific opinion on the main welfare risks related to the farming of sheep for wool, meat and milk production. The request consisted of the identification of the main welfare consequences and risk factors for which a risk assessment should be performed, as well as on the identification of the animal-based measures (ABMs) to evaluate the welfare consequences. Consequences and factors should be identified for sheep (ewes and lambs) farmed for the three production purposes (meat, wool and milk) and depending on the management systems used and the sheep breed typologies.This scientific opinion on sheep welfare is the outcome of a scoping exercise for the identification of the main welfare consequences and associated risk factors acro...

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“…OPA is most often diagnosed in three- to four-year-old sheep; however, tumours have been reported in lambs as young as two months of age (Sharp and De Las Heras 2007). …”

Section: Small Ruminantsmentioning

confidence: 99%

Fog fever‐type pneumonia in housed beef cattle

2014

Veterinary Record

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Acute interstitial pneumonia with histological changes resembling fog fever associated with feeding lush silage to housed beef cattle Salmonella Mbandaka isolated from a scouring dairy calf Tracheal obstruction in ewes dosed with gelatin-coated boluses Liver lobe torsion in an adult sow following bullying Staphylococcal pododermatitis in wild red grouse These are among matters discussed in the disease surveillance report for October and November 2013 from SAC Consulting: Veterinary Services (SAC C VS)

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Contagious Respiratory Tumours

Cited by 14 publications

References 17 publications

Ovine pulmonary adenocarcinoma in slaughtered sheep: A pathological and polymerase chain reaction study

Ovine pulmonary adenocarcinoma in slaughtered sheep: A pathological and polymerase chain reaction study

Scientific Opinion on the welfare risks related to the farming of sheep for wool, meat and milk production

Fog fever‐type pneumonia in housed beef cattle

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