Department of Agronomy, Food Natural resources, Animals and Environment, University of Padova, 35010 Legnaro (PD), Italy.
Poult Sci. 2013 Sep;92(9):2433-7. doi: 10.3382/ps.2013-03013.
The study aimed to characterize muscle fiber type of the pectoralis major muscle of slow-growing chickens belonging to the Padovana local breed, the commercial strain Berlanda gaina, and their cross. Forty-five chickens (both males and females) from the different genotypes were grown up to 180 d. Histochemical and morphometrical analyses were performed to characterize muscle fiber types, myofiber density, and myofiber size of the different genotypes. The effects of genotype, sex, and their interaction were estimated. Muscle samples appeared almost entirely made up of IIB fiber type, whereas a low percentage of area (5 to 6%) was composed of hypercontracted fiber. Myofiber density was significantly higher (P < 0.05) in Padovana strains and cross-sectional area was significantly lower (P < 0.01) than in Berlanda strain. Muscle fiber characteristics appeared not to be affected by the interaction of genotype × sex.
本研究旨在描述生长缓慢的鸡种——帕多瓦那本地品种、商业品种贝兰妲·盖纳及其杂交品种胸大肌的肌纤维类型。将 45 只不同基因型的鸡（公母各半）饲养至 180 日龄。进行组织化学和形态计量学分析以确定不同基因型的肌纤维类型、肌纤维密度和肌纤维大小。估计基因型、性别及其互作的影响。肌肉样本几乎完全由 IIB 纤维类型组成，而高收缩纤维的面积比例（5%至 6%）较低。帕多瓦那品种的肌纤维密度显著更高（P < 0.05），横截面积显著更小（P < 0.01），而贝兰妲·盖纳品种则较低。基因型×性别互作似乎不会影响肌纤维特征。
