I went out to feed / water the chickens today and collect the eggs. I noticed a crack in one of the eggs and cracked it open. Frozen. I have been wondering about this since it is getting colder. My wife and I both work during the day so collecting eggs, feeding etc. does not happen until about 4:00 pm. Last night the temps were in the mid to low teens the coldest it has been this year. I have an optional heat bulb in the coop but upon advice from this forum do not want to use it unless the temps get down around zero. The birds are fine, eating well, laying well and active. Do we throw the eggs out, thaw them and feed to the dogs? Just wondering. I thought this might happen. Thanks in advance for any input.