That is definitely left over yolk in an egg sac. I have had this happen before and have lost chicks BUT I also had a few survive as well. I had a goose hatch like this who grew up and lived just fine. Give it a chance. It may die but you never know.
I wouldn't euthanize it unless it gets listless and weak. Sometimes it will still absorb the yolk if you leave it alone. If more is coming out though, that doesn't look good but give it some time alone in the incubator.
I wouldn't euthanize it unless it gets listless and weak. Sometimes it will still absorb the yolk if you leave it alone. If more is coming out though, that doesn't look good but give it some time alone in the incubator.