Probably just stress and wet litter. Your chicks at home could use a preventive. Try yogurt... just a little.
Not quite... are there more hiding behind the adults?

So cute! Thanks.
A lot of chickens will look at you like that anytime you add anything new to their feed dish. Once they try it though... stand back.
I left it long before any of the problems you later mentioned cropped up. I guess I'm not an overly patient person in some respects. People would pop onto the thread and ask "How do I do this?" without taking 5 minutes to read the first few pages to find out... they'd rather the people explain it directly to and for them.