Are cattle and grass a symbiotic relationship?

okay the symbiotic relationship between the cow and grass is that cows produce milk,meat,horns,and fur.but the grass produces food for the cow

to eat so that the cow can eat but when the grass grows the cows eat more so what the cows are doing is stoping littile bit of plultion from hveing to use a tractor to mowe the grass down.but the grass also helps the and us by produceing oxagen for us to breath because grass is a classifid as a plant