help whit eggs

[dulce]

i put 40 eggs in the incubator 15 hatch. i candle the rest of them 8 looks like there is something in them so i put them back. the other 17 was clear so i crack some of them open and it looks like some were fertile so my question is do anyone know why some of those 17 did not keep going. i have them in a sportsman 1502 incubator. the temp is set at 99.5 and the humidity is set at 60. i would like to know if there is any thing that can be done or am i doing something wrong. i have 80 more eggs in the incubator so any help would be great.

 

[ChickenCanoe]

It could be any number of things from breeder age to breeder nutrition, disease, inaccurate controllers, etc..

http://ufdc.ufl.edu/UF00008570/00001/6j