Belive this was laid by our barred rock 20 week old pullet. When washed the white spits turn brown and then go back to white. They have layer feed and free choice to oyster shells in another dish.
Should I be worried ??
'Speckled' eggs can happen for several different reasons...very few, if any, of which are a 'problem'.
Can be caused by:
Excess or uneven pigment coating.
Excess or uneven cuticle(bloom).
Excess calcium deposits.
Porous eggs can appear speckled.
Some birds lay them consistently, some only once in awhile.
The pigment or bloom can change appearance when wet, then change back when dry again.
As long as bird is getting a good diet and is healthy in every other way, it is no cause for concern.