My neighbor gave me a few 5-gallon buckets of wheat berries -- probably 20 years old. They've been stored in his cool, dry basement and seem completely fine. Can I feed straight wheat to my chickens, or will that upset their systems at all? Is there any protein in wheat like that -- can I replace some of their feed with the wheat? Or is sprouting the wheat a better option? How long do you soak wheat in order for it to sprout? Thanks!