If your birds do not eat enough calcium, then yes it can reduce your egg count per week.I should have said, would it reduce my egg volume per week going with all flock instead of layer feed. So far I like the Roo and would not want to feed him something that will harm him.
What I'm trying to stress is that your rooster is much less likely to ever have any issues eating a layer type feed compared to all of the issues your hens can have by not eating enough calcium.