Types of myosin of chickens of different strains reared in confinement and semi-confinement systems

Revista Brasileira de Zootecnia

Carani, Fernanda Regina²  Saldanha, Érika Salgado Politi Braga¹  Madeira, Luciene Aparecida³  Sartori, José Roberto³  Pizzolante, Carla Cachoni¹  Silva, Maeli Dal Pai¹ 

[1] UNICAMP, Campinas;Universidade Estadual Paulista

关键词: muscle fiber;    electrophoresis;    free range type;    rearing systems;   

DOI  :  10.1590/S1516-35982011000900017

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective was to evaluate body weight, leg weight and morphologic aspects of the muscle fibers of the flexor hallucis longus muscle and electrophoretic profile of myosin heavy chain of four strains of broilers, reared in confinement and semi-confinement systems. 1440 chicks were randomly assigned in a 4 × 2 factorial arrangement: four strains (Ross 305, Master Gris, Label Rouge and Vermelhao Pesado), two production systems (confinement and semi-confinement), with four replicates for each treatment. Four birds were sacrificed for each treatment, at 28 and 84 d, totaling 64 animals. Electrophoresis technique identified the presence of three myosin heavy chain types: MyHC-I, MyHC-IIa and MyHC-IIb, in the flexor hallucis longus muscle of the broilers. There was increase in MyHC-II and decrease in MyHC-I, as age passed. Only at 84 days-old was the MyHC-II expression influenced by strain, confirming a response of selection in Ross lineage on a more glycolytic muscle. The Ross lineage has higher live weight, leg weight, weight and area of the flexor hallucis longus, compared to different chicken strains.

【 授权许可】

CC BY-NC