I don't have catch pans under my wire pens. We have predators galore--and I've worked hard to make my pens impermeable to them. Still have occasional losses, usually due to negligence on my part. Raking up poo would not change this much for us--raccoons and foxes are going to prowl our property regularly regardless, going after the squirrels, and the chickens, ducks, and quail so enticingly displayed just out of their reach.
One way to manage waste under the pens is simply to rake high-carbon material under there to help it decompose faster. Straw, hay, dry leaves, etc. all work well for this purpose. It will also make the ground super fertile, and you can grow pretty much anything under there. Most plants are non-toxic, so you can grow almost anything you like, just pay attention to sunlight requirements--presumably your birds are in the shade, so you probably can't grow tomatoes down there.
Have fun!
One way to manage waste under the pens is simply to rake high-carbon material under there to help it decompose faster. Straw, hay, dry leaves, etc. all work well for this purpose. It will also make the ground super fertile, and you can grow pretty much anything under there. Most plants are non-toxic, so you can grow almost anything you like, just pay attention to sunlight requirements--presumably your birds are in the shade, so you probably can't grow tomatoes down there.
Have fun!