I have had times when I'll get multiple eggs with blood spots in a carton. Remember that when we are gathering and putting eggs in cartons we don't always get a full dozen out of the coop on Tuesday. More likely we get a few on Monday, a few on Tuesday and so on until that carton is full. That means that if "Flo" tends to lay eggs with spots, we have 3 of her eggs in that one carton. In my case it was Beatrice, a hatchery Red Sex Link, that tended to lay the eggs with spots in them. But I've also had them in eggs from a couple of other girls as well from time to time. Beatrice, as it turns out, had suffered from reproductive issues from day one - I was just too new at chickens to recognize it for what it was until she died unexpectedly. She was notorious for giving us rubber eggs as well, even after she was no longer a pullet and had settled into a regular laying routine. But the majority of the spotty eggs I see can be from any one girl on any given day. Just depends on where that suture line separated whether there's a bit of blood on the yolk or meat spots in the white. Some chickens never lay a single egg with them, and others like Beatrice can't seem to lay anything but. Whether there's a rooster in the flock or not doesn't influence those particular spots one bit.
I'm lucky that I live in a very small town in a rural area where most folks grew up on fresh eggs and the egg spots don't bother them a bit because they are used to seeing them. But to someone who hasn't seen them before, that "yuck factor" can be plenty strong. I know because I shudder too. <sigh> I know, I know, they are nothing and shouldn't bother me. But the truth is they do, and I have plenty of eggs without blood spots where that one came from so I have no problem giving one I won't eat to the dogs. I prepared a small handout I give to new customers explaining what those spots are, why they happen, and assuring them that if they find more than one in a carton they can certainly let me know and I'll either throw in a few more or give them a full or partial refund. I also explain in that handout that commercial eggs have them too - but with high powered computerized candlers they can pull them before they are ever packaged and sold. Folks are often surprised to know that those rejected eggs are used in other products they probably have in their kitchens right now. When I was first setting up my home and buying eggs, you could get eggs with spots in them from the store. They were graded differently then, too, not just by size but by quality. The cheaper eggs were usually smaller and there were sometimes spots in them. But buying groceries on a dime meant that you bought what you could afford, and you just took your chances on cheaper eggs at times. And back then I just got the spots out any way I could and used every one of the eggs in that carton.
