J. Anim Sci.
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J. Anim Sci. 1974. 39:68-72.
© 1974 American Society of Animal Science
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Isometric Contractile Properties of Skeletal Muscle from Stress Susceptible and Stress Resistant Pigs1

D. R. Campion2, G. Eikelenboom3 and R. G. Cassens

University of Wisconsin, Madison 53706

Abstract

The objective of this study was to determine if differences in the isometric contractile properties of the tibialis anterior muscle, measured in situ, existed between stress-susceptible (SS) and stress-resistant (SR) pigs. At the basal rate (0.5 impulses/sec.) of stimulation the mean contraction time and 1/2 relaxation time were longer (P<.05) and the mean twitch tension greater (P<.05) for the SS pigs. When the preparations were stimulated for 2 min. at 10 impulses/sec, the mean percent minimum tension was less (P<.05) for the SR pigs. When the blood supply to the muscle preparation was occluded the mean percent maximum tension was also less (P<.05) for the SR pigs. The longer CT and 1/2 RT and greater twitch tensions found for the SS pigs are discussed in terms of a decreased ability of the sarcoplasmic reticulum of these animals to regulate the sarcoplasmic concentration of calcium ions.

Footnotes

1 Research supported by the College of Agricultural and life Sciences, University of Wisconsin, Madison, by ARS, USDA Cooperative Agreement No. 12-14-100-11, 214(44) and by Public Health Service Grant No. FD-00107-14. Muscle Biology Laboratory Manuscript No. 65.

2 Present address: Department of Animal Science, Iowa State University, Ames.

3 Present address: Research Institute for Animal Husbandry "Schoonoord" Zeist, The Netherlands.






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Copyright © 1974 by the American Society of Animal Science.