Grass feeding isn't optimal for health and production of dairy cows - now they typically get fed TMR (total mixed ration) year-round. It's a blend of grain, sil

Grass feeding isn't optimal for health and production of dairy cows - now they typically get fed TMR (total mixed ration) year-round. It's a blend of grain, silage, hay, minerals, and water that gets regularly adjusted by a nutritionist as the ingredient quality/availability changes (batches of hay and silage can vary quite a bit). The other downside of grass feeding is that it takes a lot of land per cow, and the land has to be the same place as the cow. Source: family dairy farm