Investigação

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Measurements on the epidermis and sweat glands of four bovine breeds.

Ano
2001
Abstract

The Alentejo region, in the south of Portugal, has very hot and dry summers. Bovine adaptation to this climate depends greatly on the breed thermolysis capacity, and the failure to adapt this climate can lead to severe heat stress, reducing libido, fertility and embryonic survival as well as ingestion, growth and production. The epidermis is a layer of first importance in animal thermo‑regulation, because it is a main physical barrier to the heat flow. No previous study has been conducted in the Alentejo region with the characterisation’s purpose of the sweat glands and epidermis measuring. The purpose of the present work was to measure the epidermis thickness as well as the lumen perimeter and wall thickness of sweat glands of four bovine breeds present in the Alentejo region, which two of them are local (Alentejana and Mertolenga) and the other foreign (Limousin and Friesian). For such purpose, samples were taken from 24 animals and afterwards prepared and microscopically observed. Afterwards, the stratum corneum, stratum lucidum, stratum granulosum and stratum basale thickness was measured as well as the thickness of the overall epidermis. The perimeter of the sweat glands lumen was also measured as well as the thickness of the sweat glands walls Data was then statistically treated and the following conclusions were drawn: the average stratum corneum thickness reaches from 2.6 ± 0.9 µm (Mertolenga breed) to 8.0 ± 1.1 µm (Friesian breed). The average minimum value for the sum of the stratum lucidum, stratum granulosum and stratum basale thickness is 38.2 ± 5.5 µm (Friesian breed) and this maximum value is 49.1 ± 5.1 µm (Limousin breed). The values for the overall epidermis thickness reach from 43.4 ± 6.3 mm (Friesian breed) to 53.1 ± 4.6 mm (Alentejana breed). As far as the perimeter of the sweat glands lumen is concerned, the average lumen perimeter minimum is 267.8 ± 130.7 µm (Friesian breed) and the maximum is 414.0 ± 317.3 µm (Alentejana breed). The average wall thickness of the sweat glands varies from 16.2 ± 1.8 µm (Mertolenga breed) to 18.8 ± 1.3 µm (Friesian breed). Apparently the four studied breeds have baggy‑shaped sweat glands.

Palavras Chave

Alentejo; cattle; epidermis; sweat glands.

Tipo de Artigo
Investigação
Tipo de Revisão
Nacional
Âmbito Geográfico
Nacional
Situação
Publicado
Referência

Morais, P.; Capela, F.; Silva, F.; Pereira, A.; Cabrita, A.; Silva, J. (2001). Measurements on the epidermis and sweat glands of four bovine breeds. Revista Portuguesa de Zootecnia , 8: 96‑100.