That's funny because ours want nothing to do with any kind of canned fish. That's a surprise based on how many BYC members share their birds' love of tuna and catfood.
I keep a little mealworm farm in the closet and hand those out liberally 2-3 times a month during molt for an...
I've spent more time lately observing the molt with this thread in mind. Sticking with a shaky "no" vote. There was slightly reduced commercial feed intake for 2-5 days in the middle of the molt but nobody has gone significantly off of it.
Notes: our birds are in their 1st through 3rd molts...
After 2 years of observing molts, I'll say ours don't go off their feed.
They get runny poop for about a week, take more naps and have a short fuse with other chickens for 1-2 weeks, and get pale/smaller combs for a few months. During the worst of the molt, it looks like they feel like we do...