Jordan Green is a farmer that sells (or did for a good while) piglets to polyface. He throws down seed with the intention of the hogs eating up to 30% I think. Their rooting incorporates the seed into the soil some, which would protect some from birds. I'll see if I can find the videos he did on it years ago.
Discussion
I know the exact video, but my thinking is just that the canopy is too dense to worry about putting down seed until next year when I *should* get to the stage where I'm trying to actually throw down seed VS let what's in the seed bank come up.