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The aim of this study was to determine the relationships among muscle fiber‐type composition, fiber diameter, and myogenic regulatory factor (  MRF)   gene expression in different skeletal muscles during development in naturally grazing Wuzhumuqin sheep. Three major muscles (i.e. the Longissimus dorsi ( LD ), Biceps femoris ( BF ) and Triceps brachii ( TB )) were obtained from 20 Wuzhumuqin sheep and 20 castrated rams at each of the following ages: 1, 3, 6, 9, 12 and 18 months. Muscle fiber‐type composition and fiber diameter were measured using histochemistry and morphological analysis, and   MRF   gene expression levels were determined using real‐time  PCR . In the  LD  muscle, changes in the proportion of each of different types of fiber (I,  IIA  and  IIB ) were relatively small. In the  BF  muscle, a higher proportion of type I and a 6.19‐fold lower proportion of type  IIA  fibers were observed ( P  <   0.05). In addition, the compositions of type I and  IIA  fibers continuously changed in the  TB  muscle ( P  < 0.05). Moreover, muscle diameter gradually increased throughout development ( P  < 0.05). Almost no significant difference was found in   MRF   gene expression patterns, which appeared to be relatively stable. These results suggest that changes in fiber‐type composition and increases in fiber size may be mutually interacting processes during muscle development.

animal science journal

Relationships among muscle fiber type composition, fiber diameter and   MRF   gene expression in different skeletal muscles of naturally grazing Wuzhumuqin sheep during postnatal development