I have a lot of trees in my backyard, especially pine trees, and lately I've been rakeing a lot of pine needles and putting them in my chicken pens. The chickens seem like they love to scratch in it so I give them all I can give them. Since I have so many trees I've put about a foot of straw in each pen and they've stomped it down to just 3 inches. I'm sure this is going to be making a lot of compost but I'm wondering if it's going to be good to use since it's composed of pine needles and chicken poo, which are both pretty acidic aren't they?