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This year I had a 95.7% hatch rate with my SOP and EBO orps. The SOP birds were hatching earlier, English birds right on time. I put it down to the heat this summer and fall. Now, I'm not so sure. I'm cranking my incubator down a 1/2 degree since I have realized that I had a 77%Cockerel hatch rate. Lets see if we can do a mama Gator experiment here........ Nothing ventured, nothing gained. Anybody else played with this ??Yeah mine do a lot better job than me(I don't ever remember getting a 100% hatch rate) they do and under not so much of what a lot of folks try to make an ideal situation/surroundings either. You can't copy them with artificially man-made materials, or info, for sure.
Jeff
Only from what I've read here and on another forum, the sex is determined at conception and by the female (unlike in humans) These same folks state that male embryos tend to be "less fragile" than female embryos and therefore more males are likely hatched than females. I have read it to be a myth that temperature has anything to do with the male vs female outcome of a hatch. I hatched between 120 - 130 chicks last year and overall(not looking at each hatch), I had a few more pullets than cockerels but not considerably so. I hatched from Dec thru March last yearThis year I had a 95.7% hatch rate with my SOP and EBO orps. The SOP birds were hatching earlier, English birds right on time. I put it down to the heat this summer and fall. Now, I'm not so sure. I'm cranking my incubator down a 1/2 degree since I have realized that I had a 77%Cockerel hatch rate. Lets see if we can do a mama Gator experiment here........ Nothing ventured, nothing gained. Anybody else played with this ??
Bentley have you ever checked/recorded the humidity level under a broody hen? I seem to have a harder time figuring out the humidity levels then temps. I know what works for my guinea eggs but I read so many different things about chick eggs, some say low humidity, some say higher, some say dry hatch, etc. It would be nice to know what the humidity levels are under a chicken when she is hatching eggs.
Penny
Tease! LOL I would be interested in the reasons, and if it's just me I'll PM you to ask![]()
To make a long story short, developing embryos do better with elevated CO2 levels during the first 10 Days of incubation. I know, this is very contradictory to some of the old literature and common beliefs of the need for plenty of Oxygen by embryos, but recent research shows that this is not true. But the needs of the embryo are different during various stages of incubation so if you set multiple ages of eggs you need to ventilate as usual. So hen sits tighter during early incubation.
Also, eggs (embryos) are exothermic after 13 days of development. This means that after 13 days the embryo is producing more heat than it needs so the release of heat from around the embryo is needed. Big commercial incubators full of eggs/embryos actually spend as much time cooling, especially late in incubation as they do heating. So, the hen knows this and gets off the eggs more during the later stages of incubation.