First, I know I am late to the game but I have been searching online and found no answers to this question and I thank you for the replies (:
So, the problem is I bought 6 chickens and none are reproducing or giving eggs. I left them in the trade post for a lil bit ( not more than a year) Then put them in a pen big enough for 10 with 1 herder. Slowly over the course of few years they have been dieing off and not producing eggs. I now have 3. Disasters off.