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Growth Patterns in the Porcine Cutaneus Trunci Muscle

Purdue Agricultural Experiment Station, W. Lafayette, IN 47907

Abstract

Thirty-five crossbred (Yorkshire x Hampshire x Duroc) barrows of similar genetic background were slaughtered in groups of five as they reached mean live weights of approximately 23, 37, 52, 66, 83, 100 and 113 kilograms. Immediately after exsanguination, a sample of the right cutaneus trunci muscle was removed for preparation of frozen sections for fiber diameter measurements and characterization of fiber types with NADH-tetrazolium reductase. After carcass chilling, the left cutaneus trunci muscle was dissected free and ground for later analysis of total fat-free dry matter. The mean weight of fat-free dry matter in the cutaneus trunci muscles in the ordered live weight groups (22, 38, 65, 85, 89, 106 and 115 g, respectively) and the mean diameter of the myofibers in those groups (35,46, 51, 53, 58,62 and 66 µM, respectively) indicate that cutaneus trunci growth did not cease over the animal weight range studied. The percent white fibers (75,74,75,75,77, 79 and 70%, respectively) was unrelated to growth stage.

¹ Journal Paper No. 6992, Department of Animal Sciences.