1/2 of the eggs are not fertle. I am into the thirs clutch now. 1/2 of the eggs seem to hatch OK the other 1/2 don't grow and eventually mold and must be discarded. I open them before discarding at about 5 weeks and see no evidence of embrio growth. The mother is 20 months old and the father is 40 months old. The father has fathered clutches in the past with nearly 100% hatch rates. These are the first clutches for the mother.

Any ideas would be appreciated.

Thanks