I have a mixed flock, in the flock are 2 RIR hens, it is rare for their eggs to be fertile (2 chicks from 24 eggs, 22 clear). I am currently using their eggs for the table only because of this, and I do inspect a lot of them to see if there has been a change. 1 hen is coming onto a year old, the other is almost 3 yo. When I sat the last batch of eggs there were 2 Roos and I see chicks from both, one of them was culled. (I have a teenage roo to replace the cull) The eggs from the other hens all had decent hatch rates, which kinda tells me its not the roos. The birds all pasture/free range, they get whole grains, toasted egg shell and oyster shell. All look good, nice shinny feathers, bright red combs,,,, Do these girls just not like my roo/s? Is there something I can do to improve their fertility? Or should I just except that I will not be getting chicks from them and keep having breakfast?