Im no eggspert but looks like twins.
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Try some from another supplier. Rock Island is in my SaveMart grocery store here in Northern CAI had tried to hatch fertile eggs from Natures's yoke and none developed. At 8 days I started cracking them open and zip, zero, zilch! Don't even think they were fertile!?!?!
I tried rock island, didnt get any, maybe it was over refrigerated. Let us know what kind of chickens they turn out.
Now I have to try again! Darn it! LOLEgg "manafacturers" put the date collected on their packaging in the Julian calendar - today is May 3 so eggs collecteded today will have a 123 on the carton
I have attached a julian calendar for those interested
[ATTACHMENT=686]julian-calendar.pdf (10k. pdf file)[/ATTACHMENT]
It may help decide if the eggs are worth hatching.
I have had success with 12 and 16 day old refridgerated TJ eggs