Duck bill changing color

[RenaeHB]

I went out to check on my ducks this morning and I noticed that my female Pekin duck's bill was closer to white than it used to be. My Pekin drake's bill is still nice and bright yellow. Is there something wrong with her or is this normal? This is my first winter with ducks so I am still learning.

 

[BelovedBirds]

I went out to check on my ducks this morning and I noticed that my female Pekin duck's bill was closer to white than it used to be. My Pekin drake's bill is still nice and bright yellow. Is there something wrong with her or is this normal? This is my first winter with ducks so I am still learning.

Hormonal changes can cause colour change in the bill, I believe, but it's more likely to be nutritional.
If its a concern, you could try adding some nutridrench to her water, that would give a little boost.

Do you have photos before and recent, to compare the change?
Whatever the case, as long as she is behaving normally, I don't think it's likely to be anything too serious.