Hi MarcyG!
Can you tell us what age the hen is?
As said at the beginning of this thread yellow urates can be caused by a number of things. You said there is plenty of water available to them, have you actually seen this hen drinking? When her activity level and appetite seem normal - that's good.
Have you inspected the chicken all over to see if anything feels off? Does she feel thin (protruding breast bone)? Is her crop functioning properly (full at night, empty in the morning)? How does her belly feel compared to the others?
It might be nothing to worry about, but I would give her a once over, observe to make sure she is eating And drinking (not just putting on a show in your company) and check her crop in the morning before she eats or drinks.
Hi Cragg,
Thanks for your reply. My hen ("Aubrey" -a RIR) is approximately 3+1/2 yrs old. She's in the photo with me. Last April she had a serious infection from an internal broken egg, and almost died. Since then, she has not been laying at all. I've seen her drinking throughout the day. Her crop is a bit mushy during the day, not too firm, and is empty in the early a.m. She's eating well (I feed the flock fermented feed and they have layer crumbles available all day to self-feed as well).