Which fodder to grow for our 120 Geese?

Hey everyone. This spring, we will have 120 Geese for the first time on our farm, which eventually will become part of an agroforestry system. For now, I am looking for ways on how we can feed them most sustainably. As we do not produce our own fodder that we can store, I am thinking about growing a variety of fodder crops, which the geese can eat when they are freshly grown, hence they can do the harvest themselves. Therefore I am wondering if there is anyone who might have experience with this approach and if yes, with which crops did you work with ? I now did a pre- selection of the following crops; peas, corn, Vicia sativa, Ornithopus sativus and Onobrychis sativa. I am open for any ideas, experiences, suggestions etc.

Sandhill has some seed mixes for birds
https://www.sandhillpreservation.com/specialty

I do not have experience with growing fodder at that scale for anything, but I have read about people who do. The theme I see from the people who do it successfully is planning ahead (which you are doing), and timing (which I'm guessing you will do). The idea is to plant crops that mature at different times and move the animals to the new spot as that crop matures. Often times there are 2 or 3 crops in an area for variety (or supplemental feed of some kind), but the key is having it mature at the same time, and having a new spot that will mature about the time the geese need to be moved out of their current spot.

Good Luck! Geese are one of the next things I want to get.