How long till a chicken is fully grown?

LittleHouseDreams

In the Brooder
11 Years
Aug 21, 2008
73
1
39
Ohio
I have 13 wk BO hens and I was wondering when they will reach full size and weight. They seem so big now but I know they do not yet approach the weight that the books say my breed will reach (at least they do not feel like it when I pick them up.)
 
First of all:
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BO's will start to lay eggs at about 24 weeks, give or take. So, you are over halfway there!! Seems to take forever, but it will be well worth the wait
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Hugs
Christina
 
Thank you for the welcome! So when hens start to lay is when they are full size and weight? (Sorry if this is a lame question.)
 
It's not a lame question at all!!! How will know if you don't ask. Around 6-7 months they are their adult weight. They can start laying sooner than that though. We have a BO that has grown substantially since she started laying.
 
Thank you all very much for your input. I would not have thought it possible for some chickens not to be considered fully grown till they were 2 years old. That's very interesting. Does anyone know when a BO is considered full grown? Also just out of curiosity what breed matures the fastest?
 
Matures the fastest or puts on weight and size the fastest?

A Cornish X puts on weight the fastest, they hit harvest weight by 8 weeks, however you hardly want a full grown Cornish X just hanging around.

As far as the fastest maturing more standard breed in not sure.
 

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