It's the mainstay of all our pastures and fields. It likes moisture and lots of it. I know visitors here from drier areas of the prairies are astonished at what it can do here. To dry and it won't amount to much.
It can handle competition fine. You can broadcast in the spring or after you cut your fields and it will work, as long as you have moisture. It's an oilseed, so it can last in the soil for quite some time.
Let it go to seed every few years and you'll never have to seed down a field again.
Also allows you to put up hay late in the year as the stems themselves maintain a pretty consistent 8% protein level, even if the leaves are all gone.