What is an Eggtopsy?
Spring has arrived and with it, hatching season! Perhaps you collected and incubated eggs from your own flock, or you patiently waited for eggs to arrive in the mail from a breeder. Either way, you spent 21 days incubating and anticipating the arrival of your new babies.
Then hatch day came and went, and there are still some unhatched eggs sitting in the incubator, leaving you to wonder why some hatched, but these didn’t.
First of all, this is totally normal. In most cases, not all the eggs you set will hatch. A good hatch rate for fertile, fresh eggs from your own yard is anything over 75%, and the average hatch rate for shipped eggs is 50%.
While it’s expected that some eggs won’t hatch, those unhatched eggs can leave you guessing about what happened, and if there’s any way you can improve your hatch rate next time.
To troubleshoot your hatch, you can perform an eggtopsy, otherwise known as a “breakout analysis,” on your unhatched eggs. A breakout analysis simply means opening each unhatched egg and studying its contents for clues as to why that egg didn’t hatch.
An eggtopsy may not help you pinpoint the exact cause of death for each individual embryo, because there are so many factors affecting each stage of development. However, an eggtopsy will help you recognize patterns, troubleshoot issues, and possibly figure out the cause of a disappointing hatch.