Wooden Breast Myodegeneration of Pectoralis Major Muscle Over the Growth Period in Broilers

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Sihvo , H -K , Linden , J , Airas , N , Immonen , K , Valaja , J & Puolanne , E 2017 , ' Wooden Breast Myodegeneration of Pectoralis Major Muscle Over the Growth Period in Broilers ' , Veterinary Pathology , vol. 54 , no. 1 , pp. 119-128 . https://doi.org/10.1177/0300985816658099

Title: Wooden Breast Myodegeneration of Pectoralis Major Muscle Over the Growth Period in Broilers
Author: Sihvo, H. -K.; Linden, J.; Airas, N.; Immonen, K.; Valaja, J.; Puolanne, E.
Contributor organization: Departments of Faculty of Veterinary Medicine
Department of Food and Nutrition
Veterinary Biosciences
Antti Sukura / Principal Investigator
Veterinary Pathology and Parasitology
Department of Agricultural Sciences
Animal Science Research
Date: 2017-01
Language: eng
Number of pages: 10
Belongs to series: Veterinary Pathology
ISSN: 0300-9858
DOI: https://doi.org/10.1177/0300985816658099
URI: http://hdl.handle.net/10138/310093
Abstract: Wooden breast (WB) myopathy of broiler chickens is a myodegenerative disease of an unknown etiology and is macroscopically characterized by a hardened consistency of the pectoralis major muscle. Our aim was to describe the development and morphology of WB over the growth period in broilers. Additionally, the effect of restricted dietary selenium on the occurrence of WB was examined by allocating the birds in 2 dietary groups: restricted and conventional level of selenium. The experiment included 240 male broilers that were euthanized at ages of 10, 18, 24, 35, 38, or 42 days and evaluated for WB based on abnormal hardness of the pectoralis major muscle. The severity and the distribution of the lesion and presence of white striping were recorded. The first WB cases were seen at 18 days; 13/47 birds (28%) were affected and the majority exhibited a mild focal lesion. In subsequent age groups the WB prevalence varied between 48% and 73% and the lesion was usually diffuse and markedly firm. White striping often coexisted with WB. Histological evaluation performed on 111 cases revealed a significant association of myodegeneration and lymphocytic vasculitis with WB. Vasculitis and perivascular cell infiltration were restricted to the veins. Restricted dietary selenium did not affect the occurrence of WB (P = .44). Our results indicate that WB starts focally and spreads to form a diffuse and more severe lesion.
Subject: poultry
skeletal muscle
wooden breast myodegeneration
pectoralis major
white striping
416 Food Science
413 Veterinary science
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion

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