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Ok, so if I try BCM's again, I will go with the lower temp range. Hmm, I wonder if I can convince my husband to let me do this all over again . . .
I wouldn't necessarily try the lower temp with the BCMs. They invariably hatch later than my other eggs, even Welsummer. I think they take a littler longer to develop, all around.
From time to time, I do a few post-mortems, when I am ABSOLUTELY sure the chicks aren't going to hatch. Of those BCMs left alive(so sad) they haven't absorbed all the yolk.
I run 6 LGs. Most with egg turner and fan, but then I use a few for hatchers, too without anything. (And God forbid the fan conks out on you and you aren't around to notice! Instant overheat!) In the hatchers(no fan), I notice that if the temp drops to 97,98, 99- I'm not getting hatches. If I adjust it to 101 ish (Because of COURSE I can't get it to simply 100, most of the time, lol), then I have chicks progressing and hatching out. I try to keep it between 100 and 102, max.
I think the thing with LGs is that you have to WATCH them! You have to try to be around enough to check them multiple times a day. If you can't be, then I'd say you should go with another incubator with a fixed temp capability.
The LGs go up in the warm day, and down in the night, it's incredible. In the daytimes, I have to adjust them down, sometimes I even have to put a small book in the edge to keep the top up because between the eggs' incubation activity and the heat outside, it WILL keep heading up to 103+!
Some nights before I go to bed, I see temps of 97! I find a lower night temp not SO crucial when the eggs are just developing, but during a hatch, it can make a huge difference.
Here's a spike story though- I had a broody sitting out in a little chicken house. One day the temp outside was like 98. One of those horrible scorcher days we've had here in the Northeast. The broody left the nest and was panting around the yard like all the others, so I sent my 13yo outside with the thermometer and then forgot all about it- I had intended to check it in ten minutes! Of course my 13yo didn't remember either.....two hours later...that thermometer said 106. 8 Ameracauna eggs, maybe day 15?...ARGH. But I rushed them in and stuck them in the incubator. Turned them for a few days. Bit my nails for another few...and omg. 4 of 8 hatched! Black chicks, too! What a miracle.
I just bought an old Leahy-Montgomery Wards red wood incubator. Am so excited about this! Can't wait to try it out!
Barbara