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Lactate Metabolism by Cardiac Muscle and Liver from Pietrain and Minnesota No. 1 Pigs and their Reciprocal Crosses¹

University of Minnesota, St. Paul 55108

Abstract

The objective of this study was to determine the intrinsic capacity of heart and liver to utilize lactate in porcine breeds of varying degrees of stress-susceptibility. Experimental animals were stress susceptible Pietrain barrows (Px P), stress resistant Minnesota No. 1 barrows (Mx M) and barrows from reciprocal crosses of these breeds (Px M and Mx P). Parameters of postmortem muscle quality generally characterized Px M pigs as exhibiting values intermediate between the pale, soft, exudative musculature of Px P pigs and the normal morphology of the Mx M breed. Muscle quality in Mx P pigs tended to be close to Mx M pigs. No significant differences were noted for the capacity of cardiac muscle to convert lactate to CO₂ expressed as micromoles CO₂ per gram per hour, or on a total heart weight basis. CO₂ production from lactate by liver expressed as micromoles CO₂ per gram liver per hour was higher (P<05) in Px P than Mx P and Px M but not significantly different from Mx M; Mx M exceeded (P<.05) Mx P. Expressed as micromoles CO₂ per total liver per hour, Px P pigs exceeded Px M and Mx P (P<.05) but were not significantly greater than Mx M. It was concluded that lactic acidosis during the stress syndrome is not related to deficient hepatic or cardiac utilization of lactate since the stress susceptible Px P pigs ranked high in both characteristics.

¹ Scientific Journal Series Paper No. 9428, Minnesota Agricultural Experiment Station, St. Paul 55108.

² On leave of absence from Purdue University. Present address: Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.

³ Departments of Food Science and Nutrition and Animal Science.