High frequency of cutaneous squamous cell carcinoma in Friesian Milchschaf sheep in Uruguay

Author:

Costa Ricardo A.1,Schild Carlos1,Caffarena Dario1,Giannitti Federico1,Banchero Georgett1,DelPino Liliana1,Riet-Correa Franklin1ORCID

Affiliation:

1. Instituto Nacional de Investigación Agropecuaria, Uruguay

Abstract

ABSTRACT: 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.

Publisher

FapUNIFESP (SciELO)

Subject

General Veterinary

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