Guys, this is just my farmer logic, do with it what you will. These birds are HUGE. We know that. We also know that they are slow to develop. We're gonna do a couple of things. First, we're not going to put smaller eggs in the incubator. Just not going to do it. With other breeds we have, a slightly smaller egg hasn't been an issue, but with these BR, we going to be a bit more selective on the egg size for hatching.
I do think there is a bit of a learning curve on the right temperature for these as well. If we all share what we're learning, it'll be a help. Once the broodiness kicks in, come June, we'll let the ladies do a lot of this for us. Kathy says they are a broody bunch, so we're gonna watch for that come late spring, early summer.
I also agree here too Fred on the smaller/pullet eggs may have a whole bunch to do with this here issue you are correct these guys are monsterous even at hatch. The first time I saw my half breeds I got from Kathy BRxNH I was in awe at their size. I've never hatched chicks that size before. this is why I lean towards there needing to be some real good stuff in the yolk for the first hours of life there may just not be enough room for all that is in the smaller eggs/and usually have smaller yolks.IMO
Jeff
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