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In Sallys article in her sig, it just says to up the humidity so that the air cells don't grow too quickly, so I upped it to 50 because I had loose cells and saddle shaped ones and it worked at keeping them in the normal growth rate. Big buttttt, it also made them awful sticky with lots of gel type gook and I had to help them out at the end because as they zipped and popped the top, the gook dried onto the chicks body and they got stuck. It's a win some, lose some with shipped eggs because of the rough handling by the post.
another great reason to simply weigh if they are very expensive or extremely important eggs, what I have found with my own bator is that I add too many different eggs both shipped as well as my own so I cant mess with humidity for each sets of eggs, so I have to go with an average of what my air cell loss looks like. and use the humiditiy as a tool that way, if they grow to fast I need to add more too slow take it away
WHAT???????????? GROW TO FAST????????????? That could be it. Does more humidity make the chick grow slower or are we talking about air cells? My chicks seem to large for the shell? They cant move!!!!!
Doug look at the links in the hatching 101 article try going into a hatch of shipped eggs from all the same person and weighing the entire rack of eggs and tracking weightloss this way and control humidity by doing this and see how much you have to alter things as you go, it may be humidity it may not!