You're probably imagining the marketing depiction of "grass fed"

https://www.primalmeats.co.uk/wp-content/uploads/2016/12/gra...

But nobody said it was coming straight off the ground!

https://thumbs.dreamstime.com/b/cows-eating-trough-made-blue...

https://c8.alamy.com/comp/2CFFY4J/hay-bales-wrapped-in-heavy...