In Vietnam, consumers prefer and are willing to pay a premium for white-shelled eggs laid by indigenous chickens. Currently, egg prices depend on factors such as feed sources, chicken rearing practices, and the supplying entity.
In contrast, brown-shelled eggs often command a higher price than their white counterparts in many parts of the world. This is because the chickens that lay brown eggs tend to be larger and require more feed, resulting in higher production costs.
However, brown-shelled eggs do not offer any additional nutritional, size, or environmental benefits.
Shell color does not indicate the nutritional value of an egg. Image: Get Cracking
The variation in egg shell colors arises from pigments produced by the hen. The primary pigment in brown eggshells is protoporphyrin IX, derived from heme, which gives the shell a reddish tint. The key pigment in green-shelled eggs is biliverdin, also originating from heme. This pigment is also responsible for the greenish color in bruises.
Within the same breed of chicken, genetic factors and age can influence shell color. For instance, older hens that lay brown eggs tend to produce lighter-colored eggs over time.
According to Consumer Reports, regardless of shell color, a large egg typically contains around 70 calories, 6g of protein, 2g of saturated fat, about 185mg of cholesterol, and a long list of other nutrients. These include lecithin, vital for cell membranes, and choline, which supports brain development.
The egg yolk also contains phosvitin, a protein that maintains skin health, and carotenoids such as carotene, lutein, and zeaxanthin, which have antioxidant properties believed to reduce the risk of eye conditions like macular degeneration.
However, as Healthline points out, other factors significantly influence an egg’s nutritional content. For instance, the living environment of the hen plays a crucial role; eggs from free-range chickens raised in the sun can contain up to three to four times more vitamin D.
The type of feed given to hens also matters; those fed a diet rich in omega-3 fatty acids will produce eggs with significantly higher levels of these healthy fats. Similarly, hens that consume vitamin D-rich foods will lay eggs with elevated levels of this essential nutrient.
Source: Vietnamnet
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