How to differentiate a fertilized egg from an unfertilized egg?

[Rajesh Sethi]

Just out of curiosity, suppose one has rooster and hens, tell eggs apart.

 

[marlingardener]

Rajesh, we don't keep a rooster, so don't have fertilized eggs. However, a neighbor who has a rooster "candles" her eggs. She says to hold a fresh egg up so a candle flame (or flashlight) shines through it, and you can tell if there is an embryo in it or not.

 

[LIcenter]

Like marlingardener says, When the egg is first laid, and candled, you will see, what looks to be a blood clot. Over a short period of time you will also start to see veins emanating outward. As a young lad I worked on a duck farm, and spent many a hour candling eggs. The fertile eggs were stored in a large fridge for later incubation, while the infertile eggs were sold to bakeries, believe it or not.
(early sixties when LI was known for LI ducks, and LI potatoes)

 

[Rajesh Sethi]

I guess fresh ones are hard to differentiate, after it developes a bit it's easier.

Does it appear on first day?

 

[LIcenter]

I guess fresh ones are hard to differentiate, after it developes a bit it's easier.

Does it appear on first day?

Yes, the first day.

 

[CrazyConure]

I don't think you can actually tell on the first day. I kept a lot of breeding cockatiels and chickens, and the eggs shown fertility on the 3rd/4th day.

 

[LIcenter]

I don't think you can actually tell on the first day. I kept a lot of breeding cockatiels and chickens, and the eggs shown fertility on the 3rd/4th day.

Granted it was way back in the sixties, but I kinda remember candling the very first day. Would the size of the egg make a difference in what can be seen?

 

[Esther Knapicius]

The fertile eggs were stored in a large fridge for later

My dad raised lots of chickens, wish I could recall all he did. but one thing I do now is you don't put eggs in the fridge and expect them to later come out and hatch. but I will google this , as this ol brain is so far from that event in my life.

http://www.raising-happy-chickens.com/storing-fertile-eggs.html

 

[LIcenter]

My dad raised lots of chickens, wish I could recall all he did. but one thing I do now is you don't put eggs in the fridge and expect them to later come out and hatch. but I will google this , as this ol brain is so far from that event in my life.

http://www.raising-happy-chickens.com/storing-fertile-eggs.html

They definitely went into a fridge, and according to your link 50/60° would be okay. The fridge also had a big fan in it for, I guess keeping good air flow. When I worked at the farm, it was only summertime work, so I'm sure that 50/60° felt like a freezer to me.

 

[alp]

Like marlingardener says, When the egg is first laid, and candled, you will see, what looks to be a blood clot. Over a short period of time you will also start to see veins emanating outward. As a young lad I worked on a duck farm, and spent many a hour candling eggs. The fertile eggs were stored in a large fridge for later incubation, while the infertile eggs were sold to bakeries, believe it or not.
(early sixties when LI was known for LI ducks, and LI potatoes)