Mallard Duck Eggs

[Applejax83]

Question 1: What is the best temperature and humidity setting for incubating mallard duck eggs?

Question 2: Are the size of the air sacs at this stage normal? Are they too small?

Background: We live in a new construction neighborhood and had been watching a mother duck making a nest. Long story short, construction vehicles moved in the area and scared her off. We waited to see if she would come back and she did not, so we picked up the eggs. They were cold when we got to them put them in an incubator and a week later candled them. They were all growing. Now we are on Day 21 of the eggs being in our care. Attached are pictures of today's candling. Thanks in advance for your help and advice. We are incubating them in a Nurture Right 360 and was using this video as a guide

 

[BarnyardChaos]

Google is your friend.
"Duck eggs need to be incubated for around 25-29 days. Your duck eggs will need to be kept between 99.3-99.6ºF. You should keep the humidity of the incubator between 44 and 55% for the first 25 days and then increase it to 65% for your ducks’ final 3 days in incubation.
"Although some incubators have automatic turners, some do not. If you plan to manually turn your eggs then keep in mind that they should be turned 180º from side to side 5 times a day at the very least. This is crucial for a successful hatch and prevents your duck embryos from getting stuck to the inside of the shell."
https://www.chickensandmore.com/incubating-duck-eggs/

 

[Applejax83]

First duckling hatched about 10 minutes ago. This particular one externally pipped about 24 hours ago.

 

[Applejax83]

Four out of five ducks hatched successfully. One died inside its egg a few hours after it made a hole. It seems the egg sac was not fully absorbed and it passed away. I did not assist since it wasn't hatching for very long and the others were pipped. I tried to assist it after the rest hatched, but by the time I was able to help it was gone.

 

[Applejax83]

My next question is: When should I move the ducklings to the brooder?

 

[cavemanrich]

If your brooder is set up,, and temperature checks correct,,, place as soon as dried up,,, n fluffy.