It's been a while... on 11/10 I culled my ~3 month old F1s down to 2M and 8F, then brought them into the garage and put them on light. No eggs yet. The F1s were not strictly from my biggest birds; I set ALL eggs and have selected the largest from that group. IIRC, both roos were over 8oz and all...
For comparison:
Admittedly, a small sample size (n = 9). But it's what I have from some ebay jumbo eggs. An A&M egg slipped into the mix as well.
Day 15 (a day late for the 2 week mark): unsexed 60-75g, avg 69.6g
Week 3 hens (n = 3): 105-119g, avg 113g
Week 3 roos (n = 5): 98-125g, avg...
I have been checking back on this thread often. I didn't do any sort of reliable weighing of my first set of jumbos (from ebay). Second set (different ebay source) are averaging 55g at 13 days. First set was selected for size so I'll be hatching out F1s from them in a week. The largest were...