Kass, hold onto the last two eggs. If your light is not strong enough, sometimes the embryo is not very clearly seen.
The hot temps we have had also affects the fertility. If the eggs are not collected frequently during the heat of dayand properly stored, then eggs can get too hot.
I actually found a nest of eggs this week that the girls laid and 4 of the nine eggs were already incubating...looked like 3 to 4 day old embryos on the yolk. By bringing them into the house cooled at 72 for several hours, the chicks would have died and shown clear in the incubator.
The hot temps we have had also affects the fertility. If the eggs are not collected frequently during the heat of dayand properly stored, then eggs can get too hot.
I actually found a nest of eggs this week that the girls laid and 4 of the nine eggs were already incubating...looked like 3 to 4 day old embryos on the yolk. By bringing them into the house cooled at 72 for several hours, the chicks would have died and shown clear in the incubator.