Just wondering how many hours of constant heat it takes for a fertile egg to start development, cause my ducks when laying will sit on the eggs for a good few hours then get off until the full clutch is laid. I thought I read somewhere that it takes approx 24 hours of full heat, but don't really remember. I got 14 Call eggs from a friend and she said that the mother had started sitting, and had been sitting for about 12 hours, she took them out and left them in a container overnight and I picked them up the next afternoon, and I put them in my incubator 2 days later. I left them for 2 and a half days, that was this morning, when I opened the bator to turn them I noticed a funny discolouration on one of the eggs so I candled the lot, first egg had a tiny live embryo, next egg large blood ring..... I thought noooooooo, then the next 11 the same blood ring, and on the last egg another live embryo. Not sure if my bator killed all those embryos, or if they had already been activated then died when they cooled, but how could 2 be alive? The live embryos look way too small compared with those blood ring eggs, so what do you guys think? The temp is between 37 and 37.8 degrees celcius, and the humidity is 63%. Maybe mother duck was sitting longer than she thought? but still don't know how 2 are alive.