Growth and miserotoxin content of Columbia milkvetch following early season cattle grazing were measured. Cow/calf pairs grazed Columbia milkvetch infested rangeland near Lac du bois, British Columbia in early may. Grazing behavior was observed at 0600, 1200, and 2000 h using the bite count technique, with each cow followed for a minimum of 700 bites per grazing time. Effects of grazing on Columbia milkvetch were measured on 120 plants within the grazed area and 140 plants outside the grazed area. Basal area and height were measured before grazing began.
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