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How to tell whether an egg is fertilised or not
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How can you tell whether an egg has been fertilised or not?
Well you can incubate it and see if a baby chick grows inside (although that's not foolproof, if a chick does grow that's proof the egg had been fertilised).
Or you can open the egg and look at the little white dot on the yolk.
In an unfertilised egg, the dot (the germinal disc) is small and dense.
In the fertilised egg, even just after being laid, without any incubation, the germinal disc (also called the blastoderm) has begun to grow and is about 5mm in diameter, less dense, and often surrounded by a darker halo in the yolk - it looks like a bullseye.
Here are some examples so you can learn to identify fertile vs non-fertile eggs.
For more fascinating facts, hints and tips about caring for your chickens, and the sheer pleasure of chickens, subscribe to my channel: Chickens in my garden - New Zealand
Well you can incubate it and see if a baby chick grows inside (although that's not foolproof, if a chick does grow that's proof the egg had been fertilised).
Or you can open the egg and look at the little white dot on the yolk.
In an unfertilised egg, the dot (the germinal disc) is small and dense.
In the fertilised egg, even just after being laid, without any incubation, the germinal disc (also called the blastoderm) has begun to grow and is about 5mm in diameter, less dense, and often surrounded by a darker halo in the yolk - it looks like a bullseye.
Here are some examples so you can learn to identify fertile vs non-fertile eggs.
For more fascinating facts, hints and tips about caring for your chickens, and the sheer pleasure of chickens, subscribe to my channel: Chickens in my garden - New Zealand
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