We are recent converts to chickens and have four 9 mo. old hens (1 buff orp, 1 barred rock, 2 araucanas). The buff and the barred rock have been regular layers since late October. Within the last month, their eggs have begun to smell and taste like chicken manure. Their nest boxes are kept clean and the eggs rarely have more than a smear. Their diet has not changed since winter began and we change their water often. From what I have read so far, the odor and taste could be due to what they are eating. We have an ark style coop and it gets muddy when the snow thaws (we live in SE Idaho). We rake out the manure about once a week. Recently, I have been putting pine shavings in the bottom of the ark to absorb the excess water and minimize the formation of mud. Although we have taken better measures to keep the bottom of the coop clean, their eggs still smell and taste like manure. SO, the question is, what is causing the eggs to smell and when will it go away?