sallyj Posted May 26, 2011 Share Posted May 26, 2011 One of my hens has laid an egg with a black yolk!! Never had this before and the hens are showing no signs of illness/sickness. I have 6 of them(hybrids) and they are about 2 years old. Has anyone had this before or know what could have caused this? Quote Link to comment Share on other sites More sharing options...
Tricky Posted May 26, 2011 Share Posted May 26, 2011 Found this on another site for you. Hope it answers your question "Were they black AFTER they'd been hardboiled? Often, eggs get a coating on the yolk if they have been overcooked (boiled for too long) or the egg is a few weeks old. It is perfectly harmless and is caused by a reaction between the iron in the yolk and the sulfur in the whites. As the egg cooks, more sulfur is released from the white, and there is more of a reaction with the iron (ferrous sulfide is the result). The ferrous sulfide coats the outside of the yolk, causing it to turn black. Again, totally harmless, but a little weird looking." Quote Link to comment Share on other sites More sharing options...
sallyj Posted May 26, 2011 Author Share Posted May 26, 2011 Thanks for your reply. It was my neighbour who had the egg and I'm not sure if she had cooked it or not. I'll have to ask her. Quote Link to comment Share on other sites More sharing options...
Tricky Posted May 26, 2011 Share Posted May 26, 2011 keep us posted Quote Link to comment Share on other sites More sharing options...
sallyj Posted May 30, 2011 Author Share Posted May 30, 2011 The egg with the black yolk had not been boiled first it was raw. Any suggestions what could mean? All the hens are well. Quote Link to comment Share on other sites More sharing options...
Tricky Posted May 30, 2011 Share Posted May 30, 2011 try this link.See if it helps answer your question. http://www.poultryyouth.com/forum/viewtopic.php?f=5&t=11721 Quote Link to comment Share on other sites More sharing options...
