Dual-purpose chickens were designed for meat and eggs, but they have never lay such many eggs as special laying breed and they don`t grow up so fast as meat breed. Most dual-purpose breeds were originated in United States, for example, New Hampshire, Plymouth Rock, Black Sex Link and other.
All of these breeds will give you brown eggs. Their eggs are smaller and weight less than 1 pound. Though hybrids are more effective, breeders prefer pure breeds because crossed chickens don`t have hereditary properties.
Your flock will replacement all time if you will raise pure breeds, that`s their advantage. If there will be many cockerels in your flock, you can raise them for meat.