Day one if you are VERY EXPERIENCED. Most hatcheries have people on staff (usually Japanese based on the need for sexing in a country with limited space) that sex day old chicks. They squeeze the chick to release fecal material then flip it over, open the vent and look for a small lump to determine male or female.
You can tell a roster apart from a hen by their physical characteristics. Roosters typically have larger combs, wattles, and spurs than hens. They also tend to have longer and more colorful feathers, and they often have a more upright and pronounced posture compared to hens. Additionally, roosters are known for their crowing, while hens typically do not make as much noise.
I do not eat hens or roosters.
A term rooster is used for the male bird (the hen is a female bird) of certain species . There are chicken roosters and hens, pheasant roosters and hens, turkey roosters and hens etc. Ducks are drakes and hens. Geese are the "Goose and the Gander".
Well, hens are girls and roosters are boys...that cover it?
For adult chickens, roosters are generally a bit bigger, and have longer, showier tail feathers. You can also tell by behavior. Roosters will tend to be more commanding, and will usually avoid other roosters if they have enough space and there are enough hens, or else fight with them if the space is too small or there are not enough hens. They can also often be observed jumping on hens' backs to mate.
It is likely that the roosters are aggressive, too rough with the hens, or that there are not hens in ratio to the amount of roosters.
Hens
The amount of roosters needed for breeding hens is about one rooster per ten hens
Hens.
Yes they will.
No.
Hens are typically eaten more often than roosters because hens are better for meat production. Hens tend to have more tender and flavorful meat compared to roosters, which can be tougher and have a stronger flavor.