Summary
The extent to which muscle fibre composition was determined by the genes transmitted from parents was estimated by using successive selections of rats. A foundation population (GO) was established to carry out the selections; it consisted of 100 albino rats which were randomly chosen from heterogeneous stock. The heterogeneous stock was produced by random-mating of three strains, Wistar-Imamichi, Fischer 344 and Donryu. Successive selection for a high percentage of slow twitch fibres (% ST) was made from GO to the fourth generation (G4). The mean values of % ST changed from 50.0% in G0 to 55.6% in G4. The mean value in G4 was significantly higher than that in GO. The realized heritability in G0–G4 was calculated from the regression of selection response on the cumulated selection differential. The regression coefficient was 0.17 (SEM 0.04). The realized heritability was significantly different from 0 at the 0.05 level. We concluded that in rats about 17% of the variation of muscle fibre composition was determined by the genes transmitted from parents.
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This study was performed at The Institute of Health and Sport Sciences
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Nakamura, T., Masui, S., Wada, M. et al. Heredity of muscle fibre composition estimated from a selection experiment in rats. Europ. J. Appl. Physiol. 66, 85–89 (1993). https://doi.org/10.1007/BF00863405
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DOI: https://doi.org/10.1007/BF00863405