I was wondering if, since the hen controls gender, if biology would force every other egg to alternate, male, female, male, female and so on, or is each egg its own gamble, gender wise. The reason I'm asking is this. My copper black marans pullet, Tipsy, the first three chicks that hatched, looks like two pullets and a cockerel, then the next seven that hatched, looks like two cockerels and five pullets. Not that I am complaining! Not all the eggs hatched from either clutch. I'm wondering if I just totally lucked out, or if she is a bird that just tends to have more female offspring. I know in horses and dogs there are males that have high "filly percentage" at birth, not just counting registered babies, which can be a very misleading number. Most people I have spoken to have attributed that to having weaker male sperm that didn't make the trip as well to fertilize the egg, but in a hen, there is no trip, no work to be done, no stress on the genetic material. I don't see how, if half of all eggs ovulated are male, I could get such a high pullet ratio. Anyone know more about this subject, or have links? It is okay if it is dry and boring with no pictures, LOL. I just really want to know. Any of you have similar stories? Do you have a hen that produces a lot of roos or a lot of pullets?