Did you know Chicken Eggs with thick strong shells hatch better
Fertile chicken eggs with thick and strong shells are known to have a better chance of hatching than the chicken eggs with weak thin shells. How do you know if you have a thick shell? Well you can measure the thickness by floating eggs in a salt solution of various concentrations. Specific gravity of an egg is highly correlated wtih the thickness of the shell.
If you have an egg which looks like it has a lot of pores or clear mottled spots on the eggs those egg are weak. The porosity of the shell determines the rate of moisture loss during incubation or storage. Examine your eggs before putting them into the incubator, if you find thin, rought, abnormal shape or cracked shells do not incubate those eggs.
Odd looking shape eggs should not be set in the incubator. If you want your flock to be of quality breed, always set eggs that are not too small or too large.
Weakness of the shell is just part of poor hatch. Here are a few more tips to look for
Fertility of Egg
Eggs to old when set - set only fresh eggs 7-10 days old
Do not incubate dirty eggs
Eggs not turned often enough - Did you know a hen turns her eggs an average of 96 times in 24 hours
Temperture too high or too low
No humidity or not enough
Not following the incubator instructions
Hope this information will help you with your hatching of healthy birds.