Interest in cover crops has dramatically increased due to their many potential benefits. In addition to conservation purposes, cover crops can provide forage for livestock producers. It is important for livestock producers to consider restrictions on labels of herbicides used earlier in the growing season if they intend to use the cover crop as a forage source.
A new bulletin describes your herbicide options for grazing cover crops: https://store.extension.iastate.edu/product/crop3082
For more on cover crops: