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Distribution Heterogeneity of Muscle Fiber Types in the Rabbit Longissimus Muscle¹

Institut National de la Recherche Agronomique, 34060 Montpellier-Cedex France and and University of California, Davis 95616

Abstract

The Longissimus muscle of the rabbit was examined at four cross-sectional levels from anterior to posterior, and the total number of muscle fibers as well as the percentage of βR, R and W fiber types were estimated at each level. Significant differences were found between section levels for percentages of R and βR fiber types, but not for the W fiber type. The total number of fibers increased fourfold from anterior to posterior. The percentage of βR fibers decreased from approximately 10% at the anterior end of the muscle to 3% at the posterior end, while the percentage of R fibers increased from 34% to 41%. Enzymatic analysis of isocitrate dehydrogenase and aldolase showed no significant differences between three selected areas of the muscle which were observed to have significant differences in distribution of R and βR fiber types.

¹ Supported in part by a grant from the Délégation générale à la Recherche scientifique et technique. M° TAAP 594 bis.

² Station de Physiologie Animale.

³ Department of Animal Science.

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