Pectoral Vessel Density and Early Ultrastructural Changes in Broiler Chicken Wooden Breast Myopathy

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Sihvo , H -K , Airas , N , Linden , J & Puolanne , E 2018 , ' Pectoral Vessel Density and Early Ultrastructural Changes in Broiler Chicken Wooden Breast Myopathy ' , Journal of Comparative Pathology , vol. 161 , pp. 1-10 . https://doi.org/10.1016/j.jcpa.2018.04.002

Title: Pectoral Vessel Density and Early Ultrastructural Changes in Broiler Chicken Wooden Breast Myopathy
Author: Sihvo, H. -K.; Airas, N.; Linden, J.; Puolanne, E.
Contributor organization: Veterinary Biosciences
Departments of Faculty of Veterinary Medicine
Veterinary Pathology and Parasitology
Antti Sukura / Principal Investigator
Department of Food and Nutrition
Date: 2018-05
Language: eng
Number of pages: 10
Belongs to series: Journal of Comparative Pathology
ISSN: 0021-9975
DOI: https://doi.org/10.1016/j.jcpa.2018.04.002
URI: http://hdl.handle.net/10138/327489
Abstract: In wooden breast myopathy (WBM) of broiler chickens, the pectoralis major muscles show abnormally hard consistency and microscopical myodegeneration of unknown aetiology. To date, previous studies have focused primarily on chronic WBM and ultrastructural descriptions of early WBM are lacking. The aim of this study was to elucidate the pathogenesis of WBM by light microscopical morphometry of vessel density and the ultra structural description of early WBM changes with transmission electron microscopy. The pectoral vessel density was compared between unaffected chickens (n = 14) and two areas of focal WBM in affected chickens (n = 14). The transverse myofibre area per vessel was highest in the unaffected area of muscle from cases of focal WBM, significantly higher (P = 0.01) than in macroscopically unaffected tissue, indicating that relatively decreased blood supply may trigger the development of WBM. The ultrastructural study included unaffected chickens (n = 3), two areas offocal WBM from affected chickens (n = 3) and areas of diffuse WBM from affected chickens (n = 3). The morphologically least affected myofibres within the WBM lesion areas in light microscopy exhibited ultrastructural changes of increased sarcoplasmic reticulum diameter and mitochondrial hyperplasia. Such changes originate typically from osmotic imbalance, for which the most likely aetiologies in WBM include tissue hypoxia or myodegencration of the surrounding myofibres. The findings suggest that a relative reduction of blood supply in the major pectoral muscle occurs in the early phase of WBM, which may be linked to the ultrastructural changes of osmotic imbalance. (C) 2018 Elsevier Ltd. All rights reserved.
Subject: broiler chicken
electron microscopy
vessel density
wooden breast myopathy
SKELETAL-MUSCLE CHARACTERISTICS
MAJOR MUSCLE
SARCOPLASMIC-RETICULUM
EGG-PRODUCTION
GROWTH
MEAT
MYODEGENERATION
CAPILLARY
HYPOXIA
FIBERS
413 Veterinary science
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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