ditto! I wish I could get my head round this stuff but sadly not; it may be just a mental block or perception problemOr this one.
http://kippenjungle.nl/chickencalculator.html
Another kind of chicken math. (The site is quite old but safe) all about genetics.
Edited to add that because neither Swedish Flower nor Penedesenca are among the breeds listed, I'd need to know the genes already to use the calculator. Bummer

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