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Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens

Meat-type (broiler) and egg-type (layer) chickens were bred by intensive selection over the years, resulting in more numbers and larger sizes of myofibers. Although the characteristics are important parameters in muscle growth and meat quality, muscle bundle characteristics have not been studied in...

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Autores principales: Lee, Boin, Kim, Dong-Hwan, Lee, Joonbum, Cressman, Michael D., Choi, Young Min, Lee, Kichoon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10590882/
https://www.ncbi.nlm.nih.gov/pubmed/37877096
http://dx.doi.org/10.3389/fphys.2023.1285938
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author Lee, Boin
Kim, Dong-Hwan
Lee, Joonbum
Cressman, Michael D.
Choi, Young Min
Lee, Kichoon
author_facet Lee, Boin
Kim, Dong-Hwan
Lee, Joonbum
Cressman, Michael D.
Choi, Young Min
Lee, Kichoon
author_sort Lee, Boin
collection PubMed
description Meat-type (broiler) and egg-type (layer) chickens were bred by intensive selection over the years, resulting in more numbers and larger sizes of myofibers. Although the characteristics are important parameters in muscle growth and meat quality, muscle bundle characteristics have not been studied in poultry. Therefore, this study aimed to compare the histological characteristics of myofibers and muscle bundles in muscles between male broiler (Ross broiler breed) chickens and layer (Hy-Line) chickens. Chicken muscles, pectoralis major (PM) and gastrocnemius (GM), were sampled at the age of 49 days and stained to analyze histological characteristics. Expectedly, body weights (BWs) and weights of PM and GM muscles in 49-day-old broilers were significantly heavier than those in layers. Within PM, broilers exhibited greater number and cross-sectional area (CSA) of myofibers than layers (3.3- and 3.3-fold, respectively). The total number and CSA of PM muscle bundles were approximately 1.5 and 6.6 times greater, respectively, in broilers than layers. Moreover, broilers exhibited 2 times greater number of myofibers per bundle of PM muscle than layers. Within GM, myofiber number and CSA were 2.3- and 2.4-fold greater, respectively, in broilers than layers. In addition, the total number of muscle bundles and bundle CSA were 2.5- and 2.1-fold greater, respectively, in broilers than in the layers. The novel findings of the current study provide evidence that greater muscle mass of broilers occurs by both hyperplasia and hypertrophy of muscle bundles and myofibers.
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spelling pubmed-105908822023-10-24 Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens Lee, Boin Kim, Dong-Hwan Lee, Joonbum Cressman, Michael D. Choi, Young Min Lee, Kichoon Front Physiol Physiology Meat-type (broiler) and egg-type (layer) chickens were bred by intensive selection over the years, resulting in more numbers and larger sizes of myofibers. Although the characteristics are important parameters in muscle growth and meat quality, muscle bundle characteristics have not been studied in poultry. Therefore, this study aimed to compare the histological characteristics of myofibers and muscle bundles in muscles between male broiler (Ross broiler breed) chickens and layer (Hy-Line) chickens. Chicken muscles, pectoralis major (PM) and gastrocnemius (GM), were sampled at the age of 49 days and stained to analyze histological characteristics. Expectedly, body weights (BWs) and weights of PM and GM muscles in 49-day-old broilers were significantly heavier than those in layers. Within PM, broilers exhibited greater number and cross-sectional area (CSA) of myofibers than layers (3.3- and 3.3-fold, respectively). The total number and CSA of PM muscle bundles were approximately 1.5 and 6.6 times greater, respectively, in broilers than layers. Moreover, broilers exhibited 2 times greater number of myofibers per bundle of PM muscle than layers. Within GM, myofiber number and CSA were 2.3- and 2.4-fold greater, respectively, in broilers than layers. In addition, the total number of muscle bundles and bundle CSA were 2.5- and 2.1-fold greater, respectively, in broilers than in the layers. The novel findings of the current study provide evidence that greater muscle mass of broilers occurs by both hyperplasia and hypertrophy of muscle bundles and myofibers. Frontiers Media S.A. 2023-10-09 /pmc/articles/PMC10590882/ /pubmed/37877096 http://dx.doi.org/10.3389/fphys.2023.1285938 Text en Copyright © 2023 Lee, Kim, Lee, Cressman, Choi and Lee. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Physiology
Lee, Boin
Kim, Dong-Hwan
Lee, Joonbum
Cressman, Michael D.
Choi, Young Min
Lee, Kichoon
Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title_full Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title_fullStr Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title_full_unstemmed Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title_short Greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
title_sort greater numbers and sizes of muscle bundles in the breast and leg muscles of broilers compared to layer chickens
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10590882/
https://www.ncbi.nlm.nih.gov/pubmed/37877096
http://dx.doi.org/10.3389/fphys.2023.1285938
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