It doesn't hurt to put it out. Expect the birds will try it, then ignore it till they need it. There's lots of variation in calcium needs among birds, but in any event, don't expect to go thru a bag quickly. I don't use 50# a year. My flock is in my sig, below.Thank you. There's a lot more to chicken feed than I imagined. One more thing...mine aren't laying yet. Should I put out oyster shell anyways or wait until we're official layers?