We have 2 roosters over 7 hens a peice. 14 total birds. My question is this 7 months +ago we were hatching eggs from this group left and right fertility was awesome hatch rates perfect chicks all lived. This year our last 2 hatches have been horrible! Out of 38 eggs 6 hatched nothing different with incubation nor feed water. We feed layer pellets clean water. I am stumped the roosters are only 2 years old hens are 14-16 months old. It has been extremely hot this year will that play a part in fertility? It's only been the past two hatches last month and now this month. I still have 2 days to go to figure out what my hatch is this time so far it's not looking good at all! Any input would be greatly appreciated.