Don’t judge an egg (yolk) by its colour

Jean Clavelle, Farm & Food Care Saskatchewan

It’s a common belief that eggs with darker colour yolks are more nutritionally dense and consequently healthier than eggs with lighter coloured yolk.

Yolk colour is determined by the presence or absence of carotenoid pigments in a laying hen’s diet. It does not indicate the quality of its nutritional value.

As it turns out, that’s just not true. Yolk colour is determined by the diet the laying hens are fed. Specific feeds like corn, alfalfa or grasses contain carotenoids. These pigment molecules are absorbed by the hen and deposited in the yolk. Hen diets that contain high levels of carotenoids will result in darker coloured yolks.

In Western Canada the climate, soil and environment allow farmers to easily grow wheat. Wheat that doesn’t meet the high standards for human consumption is used as feed for laying hens. In Eastern Canada, corn is more predominantly grown and not surprisingly, is a common feed source for laying hens. Wheat contains very few carotenoid pigments whereas corn has a high level meaning that table eggs in the east are generally darker than the west.

Free range or backyard laying hens regularly eat plants like alfalfa and grasses that are high in pigments. This explains why free range eggs tend to have darker yolks.

In fact we consumers have come to expect our egg yolks to be a very specific colour depending on the region where we live. Therefore laying hen diets are controlled to ensure the yolk colour comes out just the way we like it, not too light and not too dark. How does that happen you ask? By adding colourant like marigold or capsicum extracts to their feed rations.

So now you know, regardless of the yolk colour and environment of the hen, eggs still pack the same nutritional punch loaded with quality proteins, fats and vitamins and minerals.

 

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