Abstract
SUMMARY A metabolism trial was conducted to assess some effects of magnesium alloy rumen bullets and magnesium sulfate on magnesium and calcium utilization in wether lambs fed a basal, semipurified diet (800 g/day) that contained .08% magnesium and .42% calcium. Four sheep were assigned randomly to each of four treatments: basal diet only (BD); basal diet plus two commercial magnesium bullets per animal (AB); basal diet plus two experimental magnesium bullets per animal (EB); basal diet plus supplementary magnesium (1 g/day) as magnesium sulfate (MgSO4 ). The bullets were administered at the beginning of a 9-day collection period. Both forms of magnesium supplementation increased (P<.05) plasma level, fecal excretion and urinary excretion of magnesium. Mean plasma magnesium levels (mg/100 ml) for the respective BD, AB, EB and MgSO4 treatments were 1.9, 1.9, 1.7 and 1.9 initially, and 1.9, 2.6, 2.7 and 2.3 after 9 days of treatment. Fecal excretion of magnesium was greater (P<.05) and urinary excretion was lower (P<.05) in sheep given magnesium bullets than in sheep fed magnesium sulfate; differences between treatments AB and EB were not significant. Urinary calcium excretion tended to increase
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