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Serum Magnesium Levels of Ewes Grazing Orchardgrass Topdressed with Dolomite or Calcite

West Virginia University, Morgantown 26506

Abstract

Levels of Mg in serum of lactating ewes were used to estimate the combined effect of Mg level and Mg availability in early spring orchardgrass growing on two silt loam soils topdressed with either calcite or dolomite. The study was conducted for 4 years from the time of soil treatment. Mean serum Mg was higher (P<.05) in ewes on the dolomite treated plots in only one trial; however, the proportion of animals with serum Mg below 1 mg/100 ml was smaller (P<.05) with dolomite than with calcite when data for all 4 years were combined. Forage Mg was significantly greater in the dolomite plots early in the season and tended to decline in both treatments as the forage matured.

¹ Presently Extension Agent, Ohio Cooperative Extension Service, New Philadelphia, Ohio.

² Presently a veterinarian at Elkins, West Virginia.

³ Associate Professor, Agronomy, West Virginia University.

⁴ Professor, Animal Nutrition and Physiology, West Virginia University, Morgantown.

⁵ Published with the approval of the Director of the Agricultural Experiment Station as Scientific Paper No. 1328.