Pectoral Vessel Density and Early Ultrastructural Changes in Broiler Chicken Wooden Breast Myopathy
| Autor: | Eero Puolanne, Niina Airas, Jere Lindén, H.-K. Sihvo |
|---|---|
| Přispěvatelé: | Veterinary Biosciences, Departments of Faculty of Veterinary Medicine, Veterinary Pathology and Parasitology, Antti Sukura / Principal Investigator, Department of Food and Nutrition |
| Rok vydání: | 2018 |
| Předmět: |
Male
Pathology medicine.medical_specialty 040301 veterinary sciences Pectoral muscle HYPOXIA Biology 413 Veterinary science Pectoralis Muscles Pathology and Forensic Medicine 0403 veterinary science Lesion Pathogenesis Vessel density Muscular Diseases vessel density medicine Animals Myopathy Poultry Diseases wooden breast myopathy MEAT electron microscopy General Veterinary EGG-PRODUCTION 0402 animal and dairy science Broiler 04 agricultural and veterinary sciences Hypoxia (medical) MAJOR MUSCLE SARCOPLASMIC-RETICULUM 040201 dairy & animal science broiler chicken CAPILLARY Ultrastructure Blood Vessels GROWTH medicine.symptom MYODEGENERATION Chickens SKELETAL-MUSCLE CHARACTERISTICS FIBERS |
| Zdroj: | Journal of Comparative Pathology. 161:1-10 |
| ISSN: | 0021-9975 |
| DOI: | 10.1016/j.jcpa.2018.04.002 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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