White leghorn is the best layer among chickens.Their eggs are big and white.They don't go broody and eat less than bigger breeds.
Second I think is Rhode Island red.
I read on few sites that fresh egg hatch later than older eggs. And I experienced it myself.I kept 2 eggs which was laid on the same day and all other eggs were few days old.
Those 2 eggs hatched 24 hours later than others.It may be coincidence.I am not an expert.I used broody hen for hatching...
Turning egg after 18 days have some impact.If the chicks position is wrong then when it try to pip it will get drowned.I have experienced it.Fully developed chick(even the yolk was fully absorbed) was dead inside because it was positioned wrongly.
Since one hatched I think the temperature &...
I think you are not supposed to Candle the eggs on due date.Last candling should be done on or before 17th day.Moving the eggs after 18th day make the chicks unable to position properly.