What is the name of the movie with 3 girl cows who get lost?

I used to have a song on my ipod of i think 3 or 4 girls singing a song thats in the soundtrack of a movie where there are 3 or 4 ladie cows(its a cartoon) on a farm and one wheres a hat with a flower and they get lost or something? im pretty sure its a disney movie but if you could PLEASE give me the name of the movie OR the girls music group who sang the song...I NEED IT PLEASE AND THANKS