Pathology

Update on Solutions for Wooden Breast Research

To read more content about aviNews international Dec 2021

Wooden breast (WB) continuous to be the main syndrome affecting the meat quality of broiler chickens. Significant advances have been made in understanding the myopathy’s cellular, histological, metabolic, and physiological effects.

  • The onset of this muscle metabolic disorder has been described, but the specific etiologies or factors that trigger the problem are still unclear.
  • We will review some recent research findings indicating that myopathies are related to particular changes in metabolic pathways.

However, linking the metabolic disorders with nutritional modifications to mitigate WB incidence has not been very successful. These facts give an idea of the complexity to solve the WB issue and indicate that better comprehension of all findings is vital to design strategies to mitigate this myopathy.

This article attempts to summarize the new conclusions and how they are related to previous results and practical observations.

THE MUSCLE TISSUE AND MEAT IMPLICATIONS

Let’s start understanding the histological modifications observed in WB myopathy.

Figure 1. Broiler chicken Pectoralis major showing the WB myopathy scores, 1 – 4.
A gradual progression in the diseased tissue can be observed in the images. Lesions consist of muscle fiber swelling, necrosis, degeneration, regeneration, and lymphocytic vasculitis. Diseased muscle fibers become separated and connective tissue develops around the fibers and between muscle bundles. Source: US Poultry and Egg Association Research Project 691. Barnes et al., 2017

Continua después de la publicidad.
Avinews Int WPC
Cobbcares INT
FCE curso
Ceva Int 2022

 

The impact of muscle fiber alterations is not only on texture, but the shear force also increases. This implies that the consumer will feel tougher meat during chewing.

Additionally, protein and fat ratios are altered in WB muscle and, consequently, meat contains 1.2 to 1.3% more fat.

Consequently, depending on storage time, processing, cooking methods, and consumer taste, the affected meat’s acceptability could be significantly reduced.

METABOLIC AND CELLULAR ORIGINS OF MYOPATHIES

The findings of the group led by Dr. Behnam Abasht from the University of Delaware published in the past months reveal abnormalities in muscle fat metabolism and a shift from glycolysis or carbohydrate catabolism to the use of lipids. These alterations were labeled as glucolipotoxicity.

The modifications using fat in the muscle increases the production of free radicals that damage the muscle cells.

Similarly, a Finnish group from the University of Helsinki linked WB with the more flawed broilers’ gait.

Hypoxia and oxidative stress have always been detected in muscles affected by WB, and now it has a link with the altered lipid metabolism

ROLE OF GENETIC SELECTION AND ENVIRONMENT

In the past years, several studies conducted by Aviagen have demonstrated that breast muscle myopathies’ heritability ranges from 0.04 to 0.25, which is very low and variable. The genetic correlation of myopathies with body weight and breast meat yield ranges between -0.06 to 0.41




TO CONTINUE READING REGISTER IT IS COMPLETELY FREE


Access to articles in PDF
Keep up to date with our newsletters
Receive the magazine for free in digital version




REGISTRATION




ACCESS
YOUR ACCOUNT







LOGIN


Lost your password?




MORE ABOUT Pathology

LISTEN THE MAGAZINE ON agriFM

agriFM

JOIN OUR POULTRY COMMUNITY

Access the PDF articles
Keep up to date with our newsletters
Receive the magazine for free in digital version

DISCOVER
AgriFM - The Livestock Sector Podcasts in English
agriCalendar - The events calendar of the agricultural worldagriCalendar
agrinewsCampus - Training courses for the livestock sector