I started with 32 duck eggs on the 14th of Feb.  I candled and only 5 were progressing after a week.  The rest were clear as bells... so I threw away the 27 and replaced with 16 more.  They had gotten way to cold before I gathered them, so I havent been able to tell yet on them.  They havent been in for a week yet.  Also threw away two goose eggs last night.  One was looking really black inside... in the air cell.  I broke it open and there was NOTHING in it at all.  The other... nothing either.  I can see the first 5 moving and swimming around in there. it is soooo cool to see.  I am buying 4 day old pekins after I get off work tonight.. I am so excited.