I have watched this thread for a couple of years. It works best if you count what you set/ what hatched.
I have seen several posts with additional information of survival of one week.
What I have seen is it is pretty close to 50%. If you are getting better than that, you are doing good. But generally speaking, counting the eggs set, then the eggs hatched, then the chicks that survivied one week... 50 % is the average.
Now it is important to remember that is the average - so there will be many hatches above and below that line.
I have seen several posts with additional information of survival of one week.
What I have seen is it is pretty close to 50%. If you are getting better than that, you are doing good. But generally speaking, counting the eggs set, then the eggs hatched, then the chicks that survivied one week... 50 % is the average.
Now it is important to remember that is the average - so there will be many hatches above and below that line.