Is this your first time raising broilers? Is this your first batch of broilers from a new source? Just wondering if the weight difference is being determined based on your experience, and what your experience has been.
do the broilers have access to first light all the way to last light of the day? This maximizes their time to eat. Are they given all day access to feed? Is their only food the feed that you provide, or are you expecting them to free range for a portion of the day to supplement their feed?
we’ve gotten some huge broilers in 7.5 weeks, with no supplemental light, but all day feed access. Penned, but with water and feed spread apart and elevated somewhat so they generally have to get up and walk between water and food and stand to eat. I think the source and strain of the broilers has some impact. We feed a meat bird feed (I think 22%). Males are bigger than females.