Black Copper Marans, 25 weeks. I didn't have a scale then. Grower feed.
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Bresse, 16 weeks, 2.8-3.4 lbs. The smallest from the group. Starter feed, pasture turnout.
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What we started doing was going through 10-12 at a time, skinning and processing them into thighs/legs and breast/wings and bagging. Then weighing the bags. Last harvest (just legs/thigh/wings/breast) was 11.25 pounds from 7 birds (4 Bresse and 3 Hybrids) at 16 weeks. Time before was 15.25 lbs from 12, mostly hybrids so they were lacking the fullness that the Bresse have.