How the keys are organized. The keys on your keyboard can be divided into several groups based on function: Typing (alphanumeric) keys. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter. Control keys. These keys are used alone or in combination with other keys to perform certain actions.
Introduction. The age at which your hens will begin to lay depends on their breed type. Hybrids are the earliest birds to start laying, starting about 1 month earlier than non-hybrids. Non-hybrids, which include our rare and heritage breeds, typically begin laying about one month later than hybrids. Most of the egg laying hybrids start laying at 4 to 5 months of age. These include Pearl White Leghorns, Black Stars, and Red Stars. Hybrid egg layers are bred by crossing two different lines or breeds. They are known for their excellent productivity and high feed conversion ratio.
Factor #1 - Breed. Chicken breeds that are generally considered to be layers tend to lay sooner than those considered meat or dual purpose breeds. The hybrid laying breeds start laying as early as 16 weeks. Heritage laying breeds tend to lay about 4 weeks later (20 weeks) and all other breeds will begin laying between 20-32 weeks of age. I have no hard evidence to prove this, but I suspect that the breeds that lay the most eggs each year are also ones that are likely to lay the soonest.