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Muscle Growth in the Fetal and Neonatal Pig¹

Muscle Biology Laboratory, University of Wisconsin, Madison 53706

Abstract

Growth of the musculature and skeleton was studied in fetal and neonatal pigs. Muscle growth (dry weights) was related to allometric growth of the whole body as judged by linear skeletal measurements. The relatively large size of the limbs at birth was due to their rapid fetal growth. The growth rates of eight representative muscles of the head and limbs decreased during the fetal and neonatal periods; only the growth rate of the longissimus showed a marked postnatal increase. It was estimated that myofiber hyperplasia was complete by 70 days gestation. Evidence was found to suggest that, during fetal and neonatal periods, intrafascicularly terminating myofibers grow at a faster rate than completely tendinously inserted myofibers.

¹ Research was supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison. Muscle Biology Manuscript No. 35. This work was done during the tenure of a Research Fellowship of Muscular Dystrophy Associations of America.

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