Eggs losing weight quickly - should I be concerned?

[ojb1488]

I am incubating 8 chicken eggs in the Brinsea Octagon 10 incubator. I keep the temperature at about 38.5 C (+/- 0.3 C) because it's a still air incubator. It is only day 13 and they have already lost about 10% of their original weight; some have lost 12%. I noticed they were losing weight quickly on day 7 so I filled the second water reservoir and closed off one of the vents in an attempt to increase the humidity which seems to have helped a little bit. Is there anything else I can do? Are they likely to hatch? I have candled them all and blood vessels are visible.

 

[ChocolateWingTheRooster]

I... think that’s normal? I’ve watched a few hatching videos, so I guess, in their words, just pay attention to their weight. If they loose too much it’s a concern... like, i should say, a very big amount more.

 

[ojb1488]

I... think that’s normal? I’ve watched a few hatching videos, so I guess, in their words, just pay attention to their weight. If they loose too much it’s a concern... like, i should say, a very big amount more.

Ok, thank you for reassuring me. I read that they're supposed to lose 12% by the end of the incubation period so was a bit worried that they're nearly already there.