That was the bell cow, whom, of course, none of the other cows dared to disturb.
The bell cow threw up her head and bellowed till the cow house echoed.
The bell cow threw up her head and with a loud, echoing bellow started to follow her.
The horses hurried ahead; the cows began to trot, the bell cow sending out an eager Moo-oo!
First came the bell cow followed by the bull, then the other cows and the calves.