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That's something else to think about. IMHO when people are talking about hatch ratios, they should specify whether they are talking about ratio of eggs that went into the incubator, or ratio of eggs that were developing at the time they went into the hatcher, and so on. For instance, I'm incubating araucana eggs -- and they are notorious for both low fertility AND for genetically-caused embryo death during incubation. So if I told you I got a 10% hatch ratio, folks might think I was doing something terribly wrong -- when, in fact, my conditions might be spot on. Yet another complication to factor in!
Hi, out of 100 eggs, I was just thinking if some breeds did better than others, higher number of hatches
Very good points to consider.
I read somewhere, may have been over in the genetics area of BYC, about common lethal genes in certain breeds. Some of the lethal genes caused death at a certain stage of incubation, some at pip, some shortly after hatch. Araucana was one of the breeds specifically mentioned. So you could do everything right and still have a low successful hatch rate, if you are dealing with lethal genes.
At the same time, there are some breeds that seem to be a lot tougher than others, and survive all kinds of poor conditions. I have some birds like that, my broodies have hatched eggs that have been chilled repeatedly, had broken eggs goo washed off of the multiple times during incubation, been kicked all over by hens fighting over nests, etc., and they still hatched. These are various combos of Brahma, Australorp, Orpington, EE, and Dark Cornish, with a remainder of unknown mix from a mutt roo long ago, mixed in. I know he had some game breed mixed in, I couldn't say which one.