46G-12 |
Vitamin content of ribeyes from grass- and grain-finished bison bulls from the same herd |
D. W. GIRAUD1, J. A. Driskell1, A. Sulaeman1, and M. J. Marchello2. (1) Dept. of Nutritional Science and Dietetics, University of Nebraska-Lincoln, Lincoln, NE 68583-0806, (2) Dept. of Animal and Range Sciences, North Dakota State University, Fargo, ND 58105-5727 Bison meat is gaining in acceptability as an alternative meat. Some producers and consumers believe that these animals should be raised the traditional way, that is grass-finished. Few differences in the nutrient content of meat from similarly aged animals were previously observed in four cuts from grain- and grass-finished bulls from different herds raised in different parts of North America. Our objective was to determine the vitamin content of the ribeye cuts of bison bulls from the same herd raised at the Nature Conservatory in Nebraska that were grain- or grass-finished. Ribeyes from 8 grain-finished and 10 grass-finished two-year old bulls were lyophilized. Samples were analyzed for thiamin, riboflavin, niacin, ß-carotene, retinol, and a-tocopherol using HPLC techniques, and vitamin B-6 by microbiological assay. Thiamin, vitamin B-6, retinol, and a-tocopherol content of ribeyes from grain- and grass-finished animals were similar; means±standard deviations were (per 100 g): thiamin, 0.177±0.070 mg; vitamin B-6, 0.223±0.116 mg; retinol, 0.014±0.009 mg; and a-tocopherol, 0.148±0.042 mg. Riboflavin content of ribeyes from grain-finished bulls (0.118±0.013 mg) was significantly higher, P<0.05, than those of grass-finished (0.073±0.022 mg). Niacin and ß-carotene content of ribeyes from grass-finished bulls (3.04±0.826 mg and 12.200±6.981 µg, respectively) were significantly higher, P<0.05, than those of grain-finished (1.913±0.745 mg and .063±0.177 µg, respectively). The vitamin content of ribeyes from 9 additional grass-finished bulls from the Nature Conservatories in South Dakota and Oklahoma were found to be similar to those of grass-finished bulls in Nebraska. The results suggest that some differences in vitamin content exist in ribeyes from grain- and grass-finished bison bulls; however, these differences are of little importance nutritionally in terms of human consumption. Bison ribeyes from both grain- and grass-finished bulls were good sources (>10% Daily Values) of thiamin, niacin, and vitamin B-6.
Session 46G, Muscle Foods I
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