For some odd reason I am getting a high percentage of chicks pipping at the narrow end of the egg and I'm looking for a cause. And the number of chicks that take a day longer to hatch and walk on their hocks has increased over the hatching season. These are of course culled. Breeds are large fowl Wyandotte and Bantam Delaware. The highest percentage of narrow end pippers is coming from two breed pens. Early hatch rates were very good with no issues. I started noticing the problem beginning in mid May hatches. There are no problems with the other Bantam breeds nor the Cochin breeders. All breed pens get the same feed. I use two Hovabator 2362N for incubating with auto egg turners at a temperature of 99.5 to 100. A 10% Oxine and water solution is used in the 1st water well and then dry hatch until moving to the hatcher. I candle at day 7 and again at day 10 while the eggs are in the turner to remove any questionable eggs. I hatch in a Hovabator 1602N with eggs set upright in new cardboard egg crates with holes in the bottom of the egg cups for air circulation. Temperature is 99.5. Eggs are candled when they are moved and quitters are removed before the hatcher is closed. Qxine water fills both water wells and a damp sponge is added...humidity is about 60% - 70%. In addition, I utilize broody hens and these eggs are on their side. Im beginning to see a few narrow end pippers but in fewer numbers. I have hatched this way for the past two years since getting the Hovabators. This is the first time I've had this happen in all my years of hatching eggs. I am stumped. Hopefully someone can share information/experience that will help me figure this out.