Animal tissue collections and bone fluoride concentrations at Colstrip, Mt. 1973 /

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Elemental Concentrations in Native Range Grasses from the Northern Great Plains of Montana

A study of elemental concentrations in five range grasses from the Northern Great Plains of Montana indicated levels of calcium, magnesium, iron, and manganese adequate for optimum performance of range cattle. Concentrations of copper and zinc were below established nutrient requirement levels. Concentrations of these two elements were usually highest in spring samples and decreased throughout the summer and fall. Year-to-year variation was small in spring grass collections for both elements, but summer and fall collections revealed wide fluctuations in elemental levels. For maximum performance of range cattle in the study area, copper and zinc supplements appear to be necessary during summer, fall, and winter grazing seasons.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202

Copper and Molybdenum Uptake by Forages Grown on Coal Mine Soils

Coal mine soils have shown a tendency to produce leguminous vegetation containing elevated concentrations of molybdenum (Mo). The potential for cattle developing copper (Cu) deficiency by grazing vegetated areas is increased at one mine where a shale interburden material contains elevated Mo levels. The purpose of this study was to determine if mixing or dilution of the interburden with low-Mo sandy overburden would produce vegetation with undesirably high Mo levels or low Cu/Mo ratios. Concentrations of Cu, Mo, sulfur, and Cu/Mo ratios of several legumes and one grass species grown on these alkaline coal mine soils suggest that, with the exception of white sweetclover, mixing of the Mo-bearing interburden material with sandy overburden resulted in desirable elemental levels and ratios for grazing cattle if the mine soils were covered with an adequate depth (0.6 m) of suitable topsoil. Vegetation uptake of Mo was species and site specific.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202