Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Lesões cutâneas em bovinos associadas ao consumo de ervilhaca (Vicia villosa)

Silveira, Amaro Francisco VieroPanziera, WeldenSousa, Susy Hermes deCecco, Bianca SantanaSchwertz, Claiton IsmaelGava, AldoDriemeier, DavidSonne, Luciana

Background: Hairy vetch (Vicia spp.) is a high-protein source forage to cattle. The poisoning is clinically characterized by a systemic granulomatous disease, which causes dermatitis, diarrhea, decreased milk production and weight loss. The specie of hairy vetch related to systemic granulomatous disease in cattle is Vicia villosa. This work aims to describe the epidemiological, clinical, gross, microscopic and immunohistochemistry features of the skin lesions caused by the consumption of V. villosa in cattle affected by the systemic granulomatous disease.Materials, Methods & Results: A retrospective study of necropsy and biopsy exams performed between the period of 2005-2016 aiming for cattle with systemic granulomatous disease after consumption of hairy vetch was carried out in the archives of the Setor de Patologia Veterinária from the UFRGS. Epidemiological data included the sex, age, and breed of the animals affected. Gross and microscopical lesions, in addition to the immunohistochemistry anti-T lymphocytes (CD3), anti-B lymphocytes (CD79a), and anti-macrophages (CD68) features, were evaluated. The histological lesions and immunohistochemistry staining were quantified in mild (+), moderate (++), and severe (+++). The diagnosis of systemic granulomatous disease with skin lesions after consumption of Vicia villosa was observed in eight cattle. All animals were females, with 5-8 year-old (average 6.6 years), Holstein Friesian cattle (7) and Jersey (1) breeds. These cattle had a clinical history of severe pruritus, anorexia, apathy, decreased milk production, weight loss, and hyperthermia. Grossly, lesions were characterized by alopecia (8/8), crusts (7/8), lichenification and seborrhea (2/8), and exudative lesions (2/8), and involved the head (7/8), limbs (5/8), neck (4/8), trunk (4/8), perineum area (3/8), udder (3/8), and tail (3/8).[...](AU)

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