Big problem with my work about chickens?

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Question by Ariadna Jatymowicz: Big problem with my work about chickens?
I’m writing sort of book for my university, it’s about chickens behavior. I have a problem with english title (book is in polish, only title have to be written in two languages). How to write correctly:
“Behavior of chicken during the breeding period in backyard”
Maintained in backyard? I don’t know if the meaning of “backyard” is the same as in Polish. Backyard as extensive system, pastured poultry, natural way.

What do you think? Answer below!