I was wondering the same thing. I have composted chicken poop in the past...with good luck. How different could it be?
I don't compost it - but the grass quality where the geese are penned is premium -- looks like I weeded, seeded, fed raked -- it is almost a drawback as it is difficult to mow it is so thick and plush. I move the geese around on fresh grass whenever they've eaten down enough, so I don't have piles from a house to compost . . . but it is is powerful stuff!