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Seasonal Changes of Mineral Content of Southern Forages

Department of Veterinary Physiology, Pharmacology, and Toxicology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803

E. B. Morgan and Laura Kilgore

Southeast Research Station, Louisiana State University Agricultural Center, Franklinton 70438

R. H. Ingraham

Department of Veterinary Physiology, Pharmacology, and Toxicology, School of Veterinary Medicine, and Department of Veterinary Science, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803

D. K. Babcock

Department of Experimental Statistics, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803

ABSTRACT

Forage samples were collected at 2-wk intervals during the grazing season from bermudagrass, bahiagrass, millet, and mixed oats and ryegrass pastures. Immature stands of the summer grasses were maintained by rotational grazing and clipping. Corn silage, sorghum silage, and concentrate samples were collected bi-weekly at feeding. Forages and silages were grown on a Providence silt loam soil and fertilized according to results of soil analyses. Sorghum silage was higher in magnesium (.34 versus .21%) and potassium (1.47 versus 1.11%) than corn silage. Both silages were low in copper, zinc, and selenium and averaged 5.6, 21.8, and .056 µg/g. Bermudagrass and bahiagrass contained less calcium and potassium than millet or oats and ryegrass. Differences existed among the grasses in manganese, copper, zinc, and selenium. Concentrations in bermudagrass, bahiagrass, oats and ryegrass, and millet were 111.1, 139.9, 84.6, and 90.0 µg/g for manganese; 8.0, 8.5, 5.8, and 15.3 µg/g for copper; 35.0, 29.4, 23.0, and 43.3 µg/g for zinc; and .164, .086, .082, and .076 µg/g for selenium. For bahiagrass, changes occurred in concentration of all minerals during April through October. For oats and ryegrass, all minerals except zinc varied during November through May. For bermudagrass, copper and phosphorus exhibited significant changes of concentration during the grazing season.