J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1983. 56:1324-1328.
© 1983 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Swatland, H. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Swatland, H. J.

Aerobic Activity in the Axis of Growing Myofibers in the Porcine Biceps Femoris1

H. J. Swatland2

University of Guelph, Guelph, Ontario N1G2W1, Canada

Abstract

Twenty-four pigs between 9 and 29 wk of age were slaughtered at intervals of 4 wk. A microscope photometer was used to measure the staining intensity of histochemical types of myofibers. Biceps femoris myofibers were categorized as either strong-ATPase or weak-ATPase. The growth in cross sectional area of strong-ATPase myofibers was greater than that of weak-ATPase myofibers (allometric growth ratio, k = 1.36, P<.005). Among strong-ATPase myofibers of animals at each different age, myofibers with a large diameter tended to have weaker succinate dehydrogenase (SDH) activity in their central axis than myofibers with a small diameter. Hence, correlations of cross sectional area with axial SDH staining (transmittance) ranged from r = .27 at 9 wk to r = .43 at 29 wk (all correlations significant, P<.005). When the means for strong-ATPase myofibers of pigs at different ages were compared, SDH staining in the central axis of strong-ATPase myofibers tended to decrease as myofibers grew larger in cross sectional area. On this basis, myofiber cross sectional area was correlated with SDH transmittance, r = .85 (P<.025). Among weak-ATPase myofibers of animals at each different age, large diameter myofibers sometimes tended to have weaker axial SDH activity than small myofibers, but no significant decrease in axial SDH activity was detected as myofibers grew larger.

Footnotes

1 Research supported by the Natural Sciences and Engineering Research Council of Canada.

2 Dept. of Anim. and Poul. Sci.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1983 by the American Society of Animal Science.