This is from MPC website.
Do you guarantee all my eggs hatch?
Our eggs are gathered daily, shipped no more than 3 days after they are laid, and stored properly to ensure freshness and improve viability. Even so, most people are happy to get a 50 percent hatch rate on shipped eggs. Firstly, even if the eggs are intact on the outside, handling by the post office can damage them enough that they do not hatch. The internal arrangements of a chicken egg are relatively delicate and can be disturbed even if the outside is completely intact.
Secondly, we cannot guarantee your hatch rate because we have no control over the incubation conditions with which you try to hatch them. Eggs will not develop into chicks unless exacting conditions of temperature and humidity are met--and even a one degree difference in temperature can cause them not to hatch or can cause the chicks that do hatch to be weak! If your thermometer is inaccurate, if the power goes off in your home during incubation, if your incubator is dirty: all these issues are simply beyond our control.
Hatching egg results will vary even if you are experienced, so while our eggs are guaranteed to arrive intact and beautiful, we cannot guarantee your results.
