Me and a buddy have been having problems with out white leghorn hatches and we need help to figure the problem out. They are on a good layer feed with high protien, there are 2 roosters and 12 hens together. We both have been having similar problems in different incubators and in different cities. The last set I had I set 35 eggs, 2 were dead on candleing and 33 I had blood rings and on day 18 movement. I had 9 hatch and 2 died during hatching and left the others for another week and no hatches. He set 42 and had 3 dead eggs and movement in the others, day 24 has come and gone for him and still nothing but they are still in lockdown hoping. all hens are a year to 2 years old and the roos are a year. Any Idea what the problem could be??