You'll want to read through these links.
https://www.backyardchickens.com/t/216685/keeping-cornish-crosses-for-layers/10
https://www.backyardchickens.com/t/263236/my-cornish-x-girls-first-birthday-pic-heavy
https://www.backyardchickens.com/t/216685/keeping-cornish-crosses-for-layers/10
https://www.backyardchickens.com/t/263236/my-cornish-x-girls-first-birthday-pic-heavy