Is this a fertilized egg?

Not necessarily, what you are referring to is the germinal disc (or blastodisc). Every chicken egg has one even if it is not fertilized. The germinal disc is the area of the egg where sperm enter into the egg (Figure 1). This is the area of the egg which will form the embryo. The disc is 2-3 mm in diameter.

When the egg is not fertilized, the germinal disc is called a blastodisc. There are four main characteristics associated with an infertile germinal disc:

1. the germinal disc is a solid white spot on the yolk.

2. the germinal disc is not uniform. It is somewhat circular but has "jagged" or "ruffled" edges.

3. the disc is about 2-3 mm in diameter.

4. many vaculoes (bubbles or holes) may be found around the edge of the disc. Sometimes vaculoes are present inside the disc.

When the egg is fertilized, the germinal disc is called a blastoderm. There are four main characteristics associated with a fertile germinal disc:

1. the germinal disc is faint: Not a solid white spot. The germinal disc consists of a faint white ring which may have a solid white spot in the center of the ring.

2. the germinal disc is about 2-3 times larger (5 - 9mm) than the infertile germinal disc.

3. Usually, there are no vacuoles visible in the center of the ring. A few vacuoles may be present on the edge of the ring.

4. the edge of the germinal disc is very smooth and uniform. Ring is predominantly circular with no "jagged" edges

Early dead embryos are similar in shape to the infertile germinal disk. The differences include:

1. the germinal disk is a mixture of solid and faint white areas.

2. the germ spot is approximately the same size as the blastoderm.

3. usually there are many vacuoles visible on the edges of the germinal disc and in the center of the germinal disc.

4. the germinal disc is not uniform. Has irregular edges and is usually not circular in shape.

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RE:

Is this a fertilized egg?

Is it fertilized if when you crack an egg, there's a little white floating in it?