Headaches caused by hormonal problems due to changes in hormones are usually experienced in one side of the head. Headaches in the back of the head are normally due to mental tension, stress, improper posture, and depression. It is mostly the kind of pain that is sharp in the head that comes and goes.
If for some reason the temperature has dropped below the correct temperature on a few occasions, you could find some of your eggs only hatching on day 22, 23, or even on day 24 or 25. Whereas fertilized chicken eggs usually take exactly 21 days to hatch, most duck eggs take 28 days, apart from Muscovy ducks.As a general rule of thumb, the eggs of Muscovy ducks take 35 days, but once again, it can vary slightly depending on conditions.andling fertile chicken eggs during incubation. Once fertilized chicken eggs have been under a brooding hen or in an incubator for a period of about three or four days, you can candle the eggs to see if they've started developing.
Iâm not sure if you are talking about âif none hatchâ or âafter some have hatchedâ. In theory chicken eggs should hatch after 21 days of incubation but thatâs just theory. Many things affect when eggs hatch, heredity, humidity, how and how long the eggs were stored, and just plain differences in individual eggs.A big factor is average incubation temperature.ine are never late but others have reported eggs in an incubator and under a broody a few days late. That 21 days is just a theory. Reality is often different. Iâve had hatches that were totally over in less than 18 hours from the first to the last.