What is wrong with this yolk?

[kylesblonde]

I've had a few like this from the same chicken...I've searched everywhere for what it could be, but not finding anything! The yolk broke, I'm referring to the weird coloration

 

[KaylorFarms]

Do you have a rooster? Maybe its fertile. Or it could be just natural color.

 

[oldhenlikesdogs]

Certain feed additives can cause mottling of the yolk, like cottonseed, and raw soybeans, as well as some wormers, and eating certain weeds like shepherds purse. Other causes are worms, and possible illnesses.

 

[kylesblonde]

Do you have a rooster? Maybe its fertile. Or it could be just natural color.

No rooster, and we collect eggs within hours of laying

 

[aart]

@kylesblonde is it just one bird that has yolks like that or all your birds?
What and how exactly are you feeding?
Do they free range?