The real question is "Why spray weeds?"
1) Spraying weeds annually becomes a habit because the weeds keep coming back
2) Most weed can not only be grazed, they are often more nutritious than your grass
3) Herbicides also affect soil biology negatively, which sets the conditions for more weeds.
4) Many weeds are pollinators which bees, butterflies and other insects need for food...which affects the birds and reptiles which also feed on those insects.
Regenerate pastures utilizing natural herd and migratory instincts of cattle.rather than fences and daily moves. Grazing schools and consulting available to help manage infrastructure costs and development. Work smarter, not harder!
migratorygrazing.com