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Journal of Animal Science, Vol 68, 148-154, Copyright © 1990 by American Society of Animal Science

Effects of Grains, Marbling and Sex on Pork Tenderness and Composition

C. B. Ramsey 1, L. F. Tribble 1, C. Wu 1, and K. D. Lind 1

1 Texas Tech University, Lubbock 79409

Crossbred barrows and gilts (n = 216) were fed corn, sorghum or wheat as the dietary grain source to determine their effects on carcass characteristics. Corn-fed pigs had larger loineye areas than sorghum-fed pigs but less marbling than wheat-fed pigs (P < .05). Carcasses of 45 barrows and 43 gilts were selected to fit three marbling groups (L = "traces" and "slight"; M = "small" and "modest"; H = "moderate" to "abundant") within grain sources to determine the effects of feed grains, marbling and sex of pig on pork composition and tenderness. Warner-Bratzler shear (WBS) values for these selected pigs showed that the corn-fed group was .45 kg more tender (P < .05) than the sorghum-fed group, but all groups were acceptably tender. Corn-fed pigs had 6 µm larger (P < .01) longissimus myofiber diameters at the 11th rib than the wheat-fed pigs, and gilts had larger (P < .05) fiber diameters than barrows. WBS and Amour Tenderometer values for cooked muscle decreased linearly (P < .002) as marbling increased (L, 3.62 kg, 17.48 kg; M, 3.24 kg, 16.85 kg; H, 2.99 kg, 15.14 kg; SE = .33 kg, 1.17 kg, respectively). Marbling score was related negatively (r = -.35) to both Tenderometer and WBS values of cooked muscle.

Key Words: Carcasses • Feeds • Pigs • Pork • Tenderness • Marbling

Submitted on June 27, 1988
Accepted on May 22, 1989




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Copyright © 1990 by the American Society of Animal Science.