In 2004, I trained cows at Grant-Kohrs Ranch National Historic Site to eat Canada thistle, leafy spurge and spotted knapweed. Then, they started eating musk thistle as soon as I put them in pasture. When I trained 110 pairs to eat Canada thistle at the Jumping Horse Ranch near Ennis, Montana, they added musk thistle … Continue reading Why Cows That Learn to Eat One Weed Will Choose to Eat Others