The Leghorn is mainly used because it is the best layer chicken but other hybrid layers could be used.
A hen is a female chicken and thus would mate with a male chicken or a rooster.
It depends on what breed the hen is for example a bantam hen will be much smaller than a large chicken breed. The size of a chicken is not usually measured in dimensions anyway it is usually done in lb :)
a chicken.
A chicken, specifically a Cornish chicken although often crossed with other breeds. Despite the name, they are not a 'game bird' (hunted) but a domestic breed, and are not necessarily hens as both male and female chickens are served.
Birds prefer to flock and need companionship. A solitary hen of any chicken breed will not thrive on its own.
When chickens breed sometimes the rooster will spur the hen. This can cause severe lacerations in the hen. The saddle protects her.
All chickens are different sizes, depending if on its breed, if its a Rooste or Hen.
Breed. The breed of the hen and genetics determine the output of the oviduct.
If you mean guinea pigs no Birds do not breed with mammals... If you mean guinea hens then yes it has been done successfully. See related links for some good pictures of Chicken / guinea hen cross breeds known as GUIN-Hen
No. Dominicker (or dominick) chickens are a separate breed.
Large hen, large rooster
A mother chicken is a HEN Also Known as a broody hen/hen with a brood.