pasture grass; grass for grazing
Refers to grass grown for livestock feed, either standing in a pasture or as a crop. Not general 'grass' (草).
牛が牧草を食べている。
The cows are eating pasture grass.
この地域では牧草の栽培が盛んだ。
Pasture grass cultivation is thriving in this region.
The cows are eating the pasture grass.
In autumn, they cut and store the pasture grass.
In winter, they feed the livestock dried pasture grass.