Ummmm....I dunno? Seriously, when people ask how many birds I have, I invariably say either "I don't know" or "about 100" depending on the circumstances. I keep turkeys and chickens together and the numbers vary greatly throughout the year. In spring a large number go broody and raise chicks, which I typically grow out. Then I either sell the pullets or keep if I need replacement layers, and butcher the cockerels when they're big enough. Same with turkeys. This winter I got down to a breeding quad but over the summer each hen will be raising a clutch so the number will be, ahem, dozens.
Suffice it to say that it seems to be "enough". Last year I had a couple of hens looking ragged due to over-mating but only because they are rooster's favorites as they squat if you blink at them twice. The rest of the hens looked great. Yet there don't seem to be too many hens either as when I candled the eggs in the incubator that is currently running, I have 100% fertility.
Yeah, just getting going here, so pullet numbers aren't high enough to support a lot of cockerels with them - will likely need to house some on their own. Continuing to try to wrap my head around it.
Speaking of which, I need to get off of BYC and outside to start working on those tractor coops again...