why are the yolks gray?
231724
A greenish-gray ring may appear around a hard-cooked egg yolk. It's unattractive, but not harmful. The ring is caused by a chemical reaction involving sulfur (from the egg white) and iron (from the egg yolk), which naturally react to form ferrous sulfide at the surface of the yolk.
332717
The color of the egg shell or yolk has nothing to do with the egg's nutritional value, quality or flavor. Hens with white feathers and white ear lobes lay white eggs; hens with red feathers and red ear lobes lay brown eggs.
439581
Yolk colour is dependent on the amount of carotenoid pigments that a hen consumes. A high level of carotenoid pigments in the diet mean that the yolk will have a deeper, more orange colour, and a lower level carotenoid pigments mean the yolk will have a paler, yellow colour.
642761
As you suspected, the reason Americans eggs tend to have bright yellow yolks has nothing to do with "hormones" but rather with what we feed our hens. Beyer says egg yolk color is almost entirely influenced by the birds' diet. So if you're feeding birds yellow corn, "it gets in the egg," he explains.
1378094
If the egg is fertile, then you should see a dark spot around the middle of the egg, with some spider-like veins beginning to form around it. If its not, you should just be able to see the shape of the yellow yolk inside the egg, without any signs of an embryo or veins.
17021
The color of the yolk has very little to do with its nutritional content. ... If a hen eats plenty of yellow-orange pigments called xanthophylls, those pigments will make a darker orange egg yolk. When hens eat feed containing yellow corn or alfalfa meal, they lay eggs with medium-yellow yolks.
1470003
Egg yolks are made primarily of fats, proteins, and essential nutrients. The white part of the egg (also called the albumen) forms around the yolk later, providing cushioning between the embryo and the protective shell.
239139
But think about it: female chickens have a menstrual cycle, during which a hen's ovary sends a yolk on its path. As it moves though the reproductive tract and into the shell gland, the yolk forms into an 'egg white'.
978410
The yellow color in egg yolks, as well yellowish chicken skin and fat, comes from pigments found in plants called xanthophylls, primarily lutein, notes Han Jianlin, a geneticist at the International Livestock Research Institute.
1325884
Eggs to the rescue. Egg whites contain no fat at all, while the yolk is made of about 5 grams of fat. The good news if only about 1.6 grams of that total is saturated fat; the bad stuff. That makes an egg a nearly perfect food for a muscle-building training regime.
1017719
The reason the egg yolks break up easily on contact with a pan or taking them out of the egg is because the hen has a lack of protein in her diet. That's it in an "eggshell". It could be low quality feed, molting or stress.
808244
Many “premium” brand eggs are from chickens that are fed flower petals, commonly chrysanthemums, to make the yolks a darker yellow. Red rose petals would add an orange hue to the yellow yolk. ... Because the feed given chickens in Japan has a higher percentage of materials that are high in carotene or carotenoids.
20776
When it comes to hue of the egg, the key lies in the breed of chicken. In general, white-feathered chickens with white earlobes lay white eggs, and reddish-brown-feathered chickens with red earlobes lay brown eggs. There are also breeds that lay less commonly found blue eggs and speckled eggs.
739352
Eggs are fruits, because they have seeds in them. The yolk is like a seed.
967427
When scrambled eggs sit for a while, they tend to turn green or gray. This is a chemical reaction that happens as hydrogen sulfide in the egg white reacts with the iron in the yolk to form iron sulfide. The eggs are perfectly safe to eat like this, the problem is, they look unappetizing.
729621
The yolk colour in Australian eggs are a gorgeous orange colour compared to my usual pale yolked eggs from Canada. ... The colour of the yolk is affected by the hens diet. So when the yolks can't become yellow naturally through the hen's diet, Australian farmers may use synthetic dyes to change the colour.
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The yolk makes up about 33% of the liquid weight of the egg; it contains about 60 kilocalories (250 kJ), three times the energy content of the egg white, mostly due to its fat content. The yolk of one large egg (56.7 g total, 17.6 g yolk . All of the fat-soluble vitamins (A, D, E and K) are found in the egg yolk.