From young female chicken to adult hen Some say that a chicken can be called a hen when it has laid its first egg. If the breastbone on the chicken is cartilage and thus a bit soft in it, it is a young female chicken. But as soon as the breastbone becomes stiff and hard, the chicken can be called a hen.Click to see full answer. Keeping this in view, what is the difference between a chicken and a hen?Answer: A hen is a female chicken. And a rooster is a male chicken; the term “chicken” is used for the species as a whole.Beside above, are roosters and hens chickens? It can be difficult to determine the sex of chicks, which are baby chickens. For example, a young female chicken that is not of breeding age is called a pullet while a young male chicken of similar age is called a cockerel. Adult females are called hens, and adult males are called roosters. In this manner, do we eat chicken or hen? Unlike the case for the egg industry, where only hens are required to lay the eggs that are sold for human consumption, both male and female meat chickens can be and are grown for meat and are equally valued by the chicken meat industry.What are chickens called?A mature female chicken is called a hen. A chick is a newly hatched chicken. An immature male chicken is called a cockerel and an immature female chicken a pullet. A chicken is a bird. All domestic chickens can be genetically traced to Gallus Gallus, The Red Jungle Fowl.