Development of Bator/Brooder vs Hen Chicks

Coopa Cabana

My Coop Runneth Over . . .
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Has anyone noticed a difference in the growth rate of chicks that were incubated and raised in a brooder for the 1st month vs chicks that were set and brooder by the hen for the 1st month?

From one pairing of Bantam Cochins, I had two chicks hatch in the incubator, and were raised under artificial light in the brooder. I let her set the rest of the eggs, and she hatched 2 more, which stayed with her for the 1st month.

So the four chicks have the same dam and sire and hatched only 10 days apart. But now, 2 months later, the last two (hen) chicks, are still only 1/2 the size of their siblings. The sex of the chicks doesn't seem to make a difference, as I believe the first 2 are pullets, and the last two are a pair.
 
I have notice my hen raised chicks grow faster than my "house" brooder chicks. I think it has to do with all the running around they do outside - my brooder just does not have that type of room - plus all the scratching and looking mom makes them do.
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