Cole Taatjes

That makes sense, but just so I understand, are the broiler chickens a different breed or are they just handled differently?

Thanks for the information so far. I'm new to researching this information and most of it I understand, but sometimes the unexplained details assumed as a given, throw me for a loop.

I'm watching this video: https://www.youtube.com/watch?v=eDbn8ahhcZ8 on Joel Salatin's chicken tractors and I don't understand why some chickens are in those low 12 x 8 boxes and others have a fenced off area and a egg-laying structure. Is it just that the chickens in the small structures aren't meant for maturity and are just slaughtered at a juvenile age? I also don't understand how the chickens purify the cow manure?