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Relationship of Calcium and Magnesium to the Occurrence of Bloat in Lamb^1,2,

Iowa Agricultural and Home Economics Experiment Station, Ames

Abstract

A series of trials were conducted to determine the relationship of calcium and magnesium to the development of bloat syndrome in lambs. Calcium or magnesium carbonate applied as a foliar spray increased the severity of bloat in lambs grazing alfalfa. Drenching lambs with calcium or magnesium carbonate also increased the severity of bloat. Two chelating agents, ethylene diamine tetra-acetic acid and diethylene triamine penta-acetic acid, reduced the severity of bloat when administered directly into the rumen. DTPA was more effective than EDTA.

Drenching with magnesium carbonate increased the rumen content of cell free magnesium in samples taken 8 hours following drenching. EDTA tended to reduce cell free calcium and magnesium and salt concentration in the rumen. The results on rumen lipid levels were inconclusive.

¹ Journal Paper No. J-4359 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1267. Supported in part through funds provided by Regional Project NC-27.

² The chelates used in this study were supplied by Geigy Chemical Company, Ardsley, New York.