Too high of incubation temps, such as 105 ,more than three hours at a time is much more damaging and devastateing to the chick than if the incubator temp was on the cooler side of the normal incubator temp. High temps can cause a series malformation problems, such as missing eye, and/or crossed beak and/or brain formed outside of head (in early stages of incubation) and crippled babies such as splay leg. Can cause organ problems, such as fatal cardiac and kidney issues. The chick could hatch out with yolk sack not fully absorbed, dead in shell at hatch time,a cooked egg and chick (if temps are toooooo high) and the scary list goes on....... Too high of incubator temps should be avoided at all costs. Temp should be no more than 102.
