Ono Y, Iwamoto H, Takahara H
Laboratory of Functional Anatomy of Domestic Animals, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.
Poult Sci. 1993 Mar;72(3):568-76. doi: 10.3382/ps.0720568.
A relationship of muscle growth to fiber growth was investigated histochemically and allometrically in the chicken from 1 to 35 wk of age. Muscle fibers were classified into three types (I, IIA, and IIB) based on the reactivities for myosin adenosine triphosphatase and reduced nicotinamide adenine dinucleotide dehydrogenase. Fiber type composition widely varied in the four muscles examined in this study. Longus colli dorsalis contained all three types. The Pectoralis was composed only of IIB fibers. The caudal portion of Femorotibialis medius was made up of Type I and IIA fibers. The caudal Iliotibialis lateralis and the cranial portion of Femorotibialis medius were composed of two types, IIA and IIB. These latter two muscles showed a progressive increase of Type IIA fibers and decrease of Type IIB fibers with advancing age. Two processes controlling muscle growth were elongation and enlargement of muscle fibers. The elongation of muscle fibers stops by 15 wk of age, coincident with the cessation of bone growth. However, the enlargement of muscle fibers, the increase in diameter of muscle fibers, continued until 35 wk of age. The rate of enlargement of muscle fibers varied by muscle and fiber type. In general, greatest growth occurred in Type IIB fibers of hindlimb muscles.
在1至35周龄的鸡中，通过组织化学和异速生长法研究了肌肉生长与纤维生长之间的关系。根据肌球蛋白三磷酸腺苷酶和还原型烟酰胺腺嘌呤二核苷酸脱氢酶的反应性，将肌纤维分为三种类型（I、IIA和IIB）。在本研究中检测的四块肌肉中，纤维类型组成差异很大。背最长肌包含所有三种类型。胸肌仅由IIB型纤维组成。股胫内侧肌的尾部由I型和IIA纤维组成。胫外侧肌尾部和股胫内侧肌头部由IIA和IIB两种类型组成。随着年龄的增长，后两块肌肉中IIA型纤维逐渐增加，IIB型纤维逐渐减少。控制肌肉生长的两个过程是肌纤维的伸长和增粗。肌纤维的伸长在15周龄时停止，与骨骼生长的停止同时发生。然而，肌纤维的增粗，即肌纤维直径的增加，一直持续到35周龄。肌纤维的增粗速率因肌肉和纤维类型而异。一般来说，后肢肌肉的IIB型纤维生长最为显著。
