Same question, different birds....I have Buff Orp's, RIR, EE's and Plymouth Rocks with a RIR rooster.  What can I expect? I am just starting to read up and learn about incubating and want to start my first batch after the holidays.
 
Another question (and I understand it may be for a different thread) but my RIR rooster is 7 months old.  He is definitely active with the ladies.  Outside of cracking open the egg, how do I know if an egg is fertile.  Should I take a couple of days worth and crack them open until I see a few fertile eggs?
 
If I put them in the incubator, I understand that after 7 days I should she heavy veins on the fertile eggs.  If I don't see ANY veins, does the egg go in the trash or is it still good to eat?  I know it sounds like a weird question, but like I said,  I a very new to incubating.