The spread of leafy spurge (Euphorbia esula) seeds though the wool and feces of sheep was measured in southwestern Montana (45° 40’ N; 111° 33’ W) during the summers of 1993 and 1994. Yearling lambs were grazed at 4 AU/2.4 ha which is the equivalent of a light grazing intensity from late May to mid-August. Wool was collected following grazing in 1993 and tested for leafy spurge seeds. Density of leafy spurge seeds and capsules were estimated in each paddock before grazing began. Fresh fecal material was collected on days 4, 10 and 14 after sheep grazed a paddock and the number of capsules and seeds were counted. Seeds were also tested for viability.
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