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Effects of Type and Breed of British, Zebu and Dairy Cattle on Production, Palatability and Composition. IV. Yield of Gastrointestinal Tract and Other Non-Carcass Components¹

University of Tennessee, Knoxville, and U. S. Department of Agriculture

Abstract

Over a 5-year period 154 steers of six breeds and a crossbred group were slaughtered to determine the yield of non-carcass components. Differences among years were significant for 25 of the 33 traits analyzed and probably were partially due to differing sources of steers and feeding methods.

Of the two British breeds Herefords had significantly higher percents of shank, tail, hide and spleen but lower percents of pluck, liver, omasum and ruffle fat than Angus. No differences in percent of the empty components of the GI tract were significant.

Within the three groups containing at least 37% Brahman breeding, straight Brahman steers tended to have lower percents of pluck, heart, caul fat and empty omasum than Brahman-British crosses or Santa Gertrudis. The latter two groups differed significantly only in percent empty large intestine.

The two dairy breeds, Holstein and Jersey, showed greater differences than any other breeds within type. The Holsteins had significantly higher percents of blood, shanks and small intestine (full) than Jerseys. Jerseys had significantly higher percent of most full and empty components of the GI tract than did other breeds. Jerseys had a significantly lower dressing percent than Holsteins, and both dairy breeds dressed significantly lower than the other five breeds tested.

¹ Published with the permission of the Directors of the Tennessee Agricultural Experiment Station, Knoxville, and the Animal Husbandry Research Division, U.S.D.A., Beltsville, Maryland.

² Animal Husbandry-Veterinary Science Department, University of Tennessee, Knoxville.

³ Present Address: Department of Meat and Animal Science, University of Wisconsin, Madison.

⁴ Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, Knoxville, Tennessee.

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