J. Anim Sci.
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J. Anim Sci. 1969. 29:882-886.
© 1969 American Society of Animal Science
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Influence of Induced Adrenal Insufficiency and Stress on Porcine Plasma and Muscle Characteristics1

D. N. Marple2, D. G. Topel and C. Y. Matsushima3

Iowa State University, Ames

Abstract

Injecting 100 mg. prednisolone daily for days resulted in atrophy of the adrenal gland. The animals were stressed 48 hr. after recieving the last prednisolone injection and then sacrificed. Susceptibility to stress was increased in the partial adrenal insufficient pigs determined by their inability to withstand 5 min. of physical exercise before slaughter. Plasma lactate levels were increased significantly (P<.05) due to the effect of the physical exercise, and blood pH at death was significantly creased among the stressed adrenal insufficient group. Initial lactic acid content of the M. longissimus was significantly lower in group two pigs when compared to group three. No significant differences were noted among 24-hr, muscle lactate levels. The glycogen content of the M. longissimus was significantly increased because of prednisolone injections, but the level of initial muscle glycogen did not appear to influence the ultimate amount of lactic acid produced by postmortem anerobic glycolysis. No significant differences were noted among treatments when M. longissimus values and color scores were examined statistically. Low levels of plasma 17-OHCS per se did not serve to increase the rate of postmortem anerobic glycolysis. The partial adrenal insufficient pigs used in this study may be unable to adequately remove high levels of lactic acid from the blood and muscle during exhaustive exercise.

Footnotes

1 Journal Paper No. J-6137 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1697.

2 Present address: Department of Animal Science, Purdue University, West Lafayette, Indiana.

3 The authors wish to express their appreciation to the Upjohn Co., Kalamazoo, Michigan, for supplying the prednisolone for this study.






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