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Respiratory Functions of Mitochondria Isolated from Stress-Susceptible and Stress-Reistant Pigs¹

University of Wisconsin, Madison 53706

Abstract

The hypothesis that skeletal muscle mitochondria isolated from stress-susceptible pigs are less resistant to high temperatures than mitochondria isolated from stress-resistant pigs was tested. Mitochondria isolated from muscle of stress-resistant pigs had a slightly greater state 3 respiratory capability than did those from stress-susceptible pigs. State 4, 2,4-dinitrophenol (DNP) stimulated, and oligomycin inhibited respiratory rates were apparently not different between the two types of pigs. There was no indication of gross differences in respiratory functions of mitochondria from muscle of stress-susceptible compared to stress-resistant pigs in response to incubation at high temperatures. The relevance of these data to the etiology of the porcine stress syndrome is discussed.

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by Public Health Service Research Grant No. FD-00107-13. Muscle Biology Laboratory Manuscript No. 40.

² Present address of G. A. Brooks is Exercise Physiology Laboratory, Department of Physical Education, University of California. Berkeley 94720.