I agree, Helenaj. I have never taken this much interest in poo in my life.
I've found that since my pullets have reached laying age their poos are changing too. They seem to eat more and poo more, and there is quite a variation in the poos depending on the time of day and the stage of their laying cycle.
As with so many things, when a pullet reached POL her whole system seems to go through a bit of an upheaval. Hopefully things will settle down soon for mine - I'm sick of the giant poos on my lawn!