r com 20 pro usb problems

[rupert]

r com 20 pro usb ,

set up with dutch bantam eggs, run on auto chicken, 37.5 c and 45% humidity, removed to hatcher on last 2 days

8 out of 12 eggs fertile, all seemed o.k., chicks stuggled to hatch, so after 2 days opened a few eggs , chicks were too big for the egg shell to turn and hatch

any ideas from experienced r com users

the only possibility i can think of , is i set eggs from young birds , but eggs seemed large enough , did not use the first lay pullet eggs

or the r com humidity reading is wrong and the 45% is actually more
any way of testing

or do others have this problem and have worked around it

cheers a disapointed rupert

 

[Davidd]

Hi, i use r-coms and i have had no problems- i set the humidity at 40% -no higher- it sounds like the humidity was too high- big wet chicks dead in shell .
I would try and calibrate the machine.
regards, David

 

[rupert]

thanks for the help

do you raise the humidty from 40% to 60 in the last 3 days

 

[Davidd]

hi, i normally hatch in a hatchmaker- but have hatched in the r-coms- i would raise it from 40 to 65 only when pipping- normally the last or second last day.
regards, david