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Year 2019 - Volume 39, Number 4
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High frequency of cutaneous squamous cell carcinoma in Friesian Milchschaf sheep in Uruguay, 39(4):251-254
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ABSTRACT.- Costa R.A., Schild C., Caffarena D., Giannitti F., Banchero G., DelPino L. & Riet Correa F. 2019. High frequency of cutaneous squamous cell carcinoma in Friesian Milchschaf sheep in Uruguay. Pesquisa Veterinária Brasileira 39(4):251-254. [Alta frequência de carcinoma cutâneo de células escamosas em ovinos da raça Frisona Milchschaf no Uruguai.] Instituto Nacional de Investigación Agropecuaria, Estación Experimental INIA La Estanzuela, Ruta 50 Km 11, Colonia del Sacramento, Colonia, Uruguay. E-mail: frcorrea@inia.org.uy
This study described five cases of squamous cell carcinoma (SCC) in the pinnae, eyelids, and eyes of Friesian Milchschaf sheep from two flocks raised under extensive conditions in Uruguay. The prevalence values for both flocks were 2.12% and 2.53%, respectively. Macroscopically, single or multiple, nodular, verrucous, or plaque-like neoplasms, with occasional ulceration and bleeding, were observed in the affected areas. Histologically, well and moderately-differentiated SCCs were diagnosed in three and two cases, respectively. The Milchschaf breed is native of Germany, and its individuals present white non-pigmented skin with the face and legs clear of fleece, thus adapted to areas with lower solar radiation. Additionally, in the German breeding systems, animals remain indoors for long periods. The increased exposure time to higher levels of solar radiation of the Uruguayan extensive production systems may be a predisposing factor for the development of SCC in this sheep breed. In Uruguay, there is more solar radiation and the production systems provide less protection against sunlight compared with the German production system. The high frequency of SCC should be considered prior to introducing European breeds with non-pigmented skin in Uruguay and other countries of the region. |
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