Take part in study on PFAS 'forever chemicals' in eggs

[HillHeadHens]

After a successful batch hatched last year in a cradled Brinsea, I have had two total failures so far this year. Eggs were candled, fertile, weighed, humidity monitored at 13% reduction, temperature monitored. I heard a tweet from one egg in the first failed batch but no other action whatsoever and zero sound or action from my recent failure. Batches were from different suppliers. Absolutely GUTTED

Does anyone have any suggestions please

[Redwing]

What did they look like when candled near the end? If they were alive at 18 days then the problem was probably humidity based

 

Can you remember your humidity readings at the start, half way through, day 18 and day 21?