J. Anim Sci.
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J. Anim Sci. 1976. 43:426-431.
© 1976 American Society of Animal Science
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In Vitro Studies of Mitochondrial and Sarcoplasmic Reticulum Function in Muscle of Stress Susceptible Pigs1

D. R. Campion2, D. G. Topel and L. L. Christian3

Iowa State University, Ames 50010

Abstract

Seven stress susceptible (SS) and six stress resistant (SR) pigs were identified by response to halothane anesthesia. Mitochondria and heavy sarcoplasmic reticulum fragments were isolated from biopsies of the semimembranosus muscle. The muscle pH was significantly lower (P<.01) in the SS pigs compared to the SR pigs at biopsy. The mitochondrial respiratory traits, state 3 and state 4 respiration, respiratory control index and ADP/O ratio, however, were not significantly different (P>.05) for the two groups of pigs. Mitochondrial ATPase activity and sarcoplasmic reticulum Mg-ATPase activity were not significantly different (P>.05) for the muscles of SS and SR pigs. The MgCa-ATPase activity of sarcoplasmic reticulum isolated from the muscle of SS pigs was significantly higher (P<.01) than that observed for SR pigs. No differences (P>.05) in mean values for pH, percentage reflectance and percentage transmission values of the longissimus muscle were observed between the SS and SR pigs, but greater variation in values for these traits was observed in muscle from SS pigs.

Footnotes

1 Journal Paper No. J-8277 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Projects 2008 and 1901.

2 Present address: U.S.D.A., Russell Laboratory, Athens, Georgia.

3 Research supported by the Iowa Agriculture and Home Economics Experiment Station and by A.R.S., U.S.D.A., Cooperative Agreement No. 12-14-100-1185-44. Appreciation is expressed to Ayerst Laboratory for providing the Fluothane and to D. L. Kuhlers for his assistance on the statistical analysis.






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Copyright © 1976 by the American Society of Animal Science.