I went searching for more info after seeing a science experiment tracking egg size of chickens given a peanut supplement.
https://www.sciencebuddies.org/science-fair-projects/project-ideas/Zoo_p020/zoology/chicken-diet-egg-size
We've got hen chicks just over three weeks old and one is a brown leghorn. Her(?) comb is already growing and my son's friend who has had more chickens than us (this is only our second set of 6) said she(?) has spurs beginning to grow. Is it too early to tell?
We had them outside for the...