So after our first poor experience with locally hatched coturnix chicks (lots of losses, mostly small birds, etc.), we ordered eggs from an out of state hatchery and incubated them ourselves. Of the 39 birds we kept (hatched more than expected so we sold some), we ended up with 16 pharaohs and 23 Texas A&Ms. We weighed the birds yesterday at 20 days of age and they are way bigger than our last lot was at 4 weeks. We have 4 birds that weighed 140 grams or more, which I think is pretty darned big. On the downside, only 6 of the pharaohs are hens. I will keep two of the biggest pharaoh roosters as breeders, but the rest are surplus. The A&Ms are intended as layers as well once we get them sexed. Aside from waiting for them to crow or checking the vent, there is no way to sex them, right? At what age should checking the vent give us a good indication of sex?