hens loosing weight & fewer eggs= crop problems, feed issues, worms??

[Lets Farm!]

Hi All!
On Tuesday, I began a post about my 1 year-old PBR, Star, who was super lethargic :

https://www.backyardchickens.com/forum/viewtopic.php?id=155322

Thank you to all who helped me out, although I fear its far from over...

Upon reading about sour/impacted crop and a bunch of other topics, when we were trying to help Star, we checked the whole flock (5 1 year olds: 3 RIR, 1 PBR, 1 BA) and most of them seem to have a least one thing going on! Help!

2 of the RIR seem to have impacted crop and the third seems to be loosing all of her bottom fluff!?
They all seem a little underweight according to what I've read. the 2 RIR I just mentioned seem very underweight and one of them does this very strange thing where she stands up kind of like a penguin and swings her neck back and forth like a cobra!? I think this is from impacted crop.

So here's the thing, they all seem happy, energetic, interested! Whatever they "have" has been going on for a long time, there's no real changes except with Star's behavior and a decrease in egg production (only one hen laid an egg today). Overall they act normal. They were playing today and dust bathing following me around, exploring, etc.

What did we do wrong?
Feed? they eat a layer ration and some food scraps. They have free access to water with ACV.
Bedding? They have hay in the coop and yard. Also in the yard are a lot of leaves, could leaves be a problem?
There are no signs of mites, but will check tonight to make sure.
Are they preparing to molt? Could it be worms?

I apologize for the long post! The vet's office said no one can see them or help me out until at the earliest Monday.

Blessings and thanks.

 

[katrinag]

Remove the ones with problem crops. NO FEED for 24 hrs. Just water if in the morning the crop is empty that is not the probelm.
If it is still full you can try oil soaked bread.

 

[briteday]

If you suspect worms I would collect a bit here and a bit there of stool specimens, collect it into one container (if one bird has worms you'll need to treat all of them anyway so it's a moot point as to which bird has the worms, IMO) and get it to the vet within an hour, ask for a fecal float. They may not have the time to do it immediately but you should get answers the same day. The test only take about 30 minutes from start to finish.