Sarcomere lengths in wooden breast broiler chickens

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Soglia , F , Petracci , M & Puolanne , E 2020 , ' Sarcomere lengths in wooden breast broiler chickens ' , Italian Journal of Animal Science , vol. 19 , no. 1 , pp. 569-573 .

Title: Sarcomere lengths in wooden breast broiler chickens
Author: Soglia, Francesca; Petracci, Massimiliano; Puolanne, Eero
Contributor: University of Helsinki, Department of Food and Nutrition
Date: 2020-12-14
Language: eng
Number of pages: 5
Belongs to series: Italian Journal of Animal Science
ISSN: 1594-4077
Abstract: The present study aims to measure the sarcomere lengths in normal broiler muscles and in non-lesion sites of breast muscles focally affected by Wooden Breast (WB). For this purpose, twenty Pectoralis major muscles (10 unaffected and 10 WB-focally affected cases) were sampled and used to measure sarcomere length by laser diffraction method. When compared with their unaffected counterpart, WB cases exhibited 13% longer sarcomeres (1.91 vs. 1.69 mu m; p <.001) measured within the non-lesioned site of the muscle. Although it is not simple to draw conclusions about the lesion properties based on the non-lesion area, but as the fibres are bound to each other, it may be reasonable to anticipate that the hardened consistency observed in WB is not ascribable to a more intense contraction of the sarcomeres. In addition, considering the current knowledge concerning this condition, it might be assumed that the longer sarcomeres observed in WB are not triggering the development of this condition but are rather a consequence of the profound alteration in the muscular structure resulting from it. Indeed, despite the outstanding improvements in the live and slaughtering traits, the selection programmes carried out in the past years have resulted in a reduced capillarization and impaired oxygen supply to the Pectoralis major of fast-growing hybrids thus affecting the physiology of its constituting fibres as well as maybe impairing their ability to synthetise new sarcomeres. This may result in a skeletal muscle injury, which would ultimately lead to necrosis and fibrosis.
Subject: Broiler
wooden breast myopathy
sarcomere length
Pectoralis major muscle
416 Food Science

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