Could a medicated feed have caused all this?

I would think the feed - gamebird feed should have way more protein than regular chook food, that would for sure bring on a molt (protein = new feather growth = old feathers move on out)

 

A light left on at night inside there house will cause them to stay awake and if left on continuously will stress them to the point of picking/pecking at each other and may trigger a molt. They probably didnt get much sleep at all if that light was left on all that time. Like you, I never use lights on my chickens. The gamebird feed may help in feather regrowth because of the high protein content, I've used it for that purpose during molts. However, mine was medicated like yours, if I saw an increase in cecal poop, I stopped and went back to 16% regular layer crumbles.

 

If you havnt wormed them in the last 9-12 months, I'd worm them. You can also trim their feathers/fluff with scissors on their rear to help prevent dirty bottoms. Yeah, you ARE giving them alot of protein. I never give mine extra protein except during hard molts...during mini molts, they get regular feed. I figure that the 16%-18% layer feed has all the minerals and nutrients that they need...after all, the manufacturers have spent millions testing the right mixtures/balances to maximize egg production. Anything less they would lose customers, business/profits. I give mine a cupful of scratch every other day as a treat, they love that lol. If what you have been feeding them works best for both you and your chickens, by all means...carry on.

 

You free range them so they may not normally be getting as much protein as you think, though maybe during their special care, they were free ranging a lot less. I'm not a proponent of stuffing extra protein down their throats, but many people do it.

I don't know why extra protein would trigger a molt. I'd suspect the special care they got while you were away. The light thing could have caused it. Maybe a big change to their routine. One I think may be a big possibility, Did they run out of water? That is a big stress inducer.

As far as worming them during a molt. One of the wormers can cause the feathers to grow back funny. I can't remember which one it is and am too lazy this morning to do a search to find out. The wormer should have a warning on the label about that, but maybe not.

If you don't mind yours looking ike they had a perm, it is not a big deal. But some people would get upset about that.

 

I have heard that by not feeding the chickens will it send them into a molt could they have not gotten feed as much or a lot less this would have brought on the molt. I would wait until their molt is over to worm them. I do up their protein to 22% while they free range and I noticed that their feathers came in super fast and really pretty this molt. So I know the extra protein helped with the molt. Good luck and I am sorry you are having this problem with your chickens.

 

The feed with bacitracin could have caused the diarrhea, thus the dirty bottoms and possibly all the stress caused the molt.

 

Better count your lucky stars. One year I was gone for two weeks and the caretaker didn't bother to shut the "Pop" door at night, I lost a chicken a night for every night I was gone-----Raccoons. And then, when I got home and started closing the door, the raccoons were so use to their nightly meal, they tore open the ventilation under the eaves and pulled out a chicken thru that 3 1/2" space. I had to do some reinforcements and trapping after that.