I consider it 100% however one egg stopped developing like 5 days in, but all were fertile. I hatched out Old English Game Bantams, Seramas, Duccles and Cochins! Heres the babies! Hatched out yesterday and today! And they say that Seramas can't be shipped well! I hand turned all these eggs, and candled them about once a week to hatching. Even had a power outage for 4 hours yesterday and they are still here! THANKS PQ!!!