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.
The one exception is Muscovy ducks. These ducks have bumpy red faces and are white, black or a mix of white and black. This breed takes 35 days from the beginning of incubation to hatch. Muscovy hens can hatch 12 to 15 eggs, including eggs from other mothers added to her clutch.Domestic ducks are of two main types, the Muscovy and ducks breeds descended from mallards.he incubation period varies by species and generally takes about a month. When the ducklings begin to crack through their shells at the end of the incubation period, they should all hatch within 24 to 48 hours. Some eggs may fail to hatch.