My neighbor farms, and he told me he would not spread horse manure with pine shavings in it. (used in stall bedding) He says the pine takes the nitrogen out of the soil and then they have to add it in another way. Plain horse manure is just fine. I never knew this. I compost EVERYTHING It eventually breaks down. I have the horse manure pile and kitchen compost goes there too. I have since bedded with straw, which is good compost. I have two piles, one is old, its like fresh dirt. The other is getting there.I'm starting to build a container to use as my compost box to put inside my chicken run. I'm breaking down an old pine crate to reuse for the container. Do you guys know if that's ok to compost with a pine box and use pine shavings in the compost??