Chickens under 2 months dropping like flys,no noticeable symptoms

[Helloworld]

Birds affected: None of the birds are younger than 1 week or older than 2 months who die. 5 different breeds in 3 seperate buildings. Birds came from 3 different sources(vaccinated Murrays Hatchery boilers, Goldfeather Farm, my own hatches.)
Symptoms: They show no symptoms then suddenly become tired and die within an hour. About 50% of affected birds seem thin. About 40% are pale before death. All become sleepy and limp, progressing to stretching and twitching then death. Any attempt to drink water and the bird dies immediately.
Things NOT happening: No adult birds affected, no poopy butts or other vent area issues, no blood in stool, not gone off feed or water before onset of illness, no wounds or injury, no mites or external parasites seen, no predator involvment. Not overly hot, chilled, wet. Not picked on by other birds
Things I've tried: Cleaned the out pens, added new bedding and lime. Treated with metronidazole one week. Wormed with Wazine. Bleaching waterers several times a week. Adding apple cider vinegar to water. Moved chicks under 1 week old into house with no improvement, burn the dead birds
Possible contributing factors In same time frame: abrupt weather change to cold and rain, 4 batches of chicks arrived from Goldfeather farms, Death of best hunting cat resulted in noticable increase in barn swallows and mice within a week.
Things that happened one week after chickens began dying:house cat diagnosed with Giardia and quarantined to sunporch of house, cat never had been outdoors or in contact with the birds.One barn cat sick with diarreha and immediately quarantined. Young kitten died of vet diagnosed heart ailment with similar symptoms prior to death.

What the back is going on here? There are so many possibilities that come up on Google it's overwhelming. Has anyone had a similar problem?

We are on rural coop water, not well water. We live in western Iowa. Our acreage is bordered by beef cattle farm/soybean fields. The tiny babies have a heat lamp in the house but I've used the same bulb for 4 batches and this is the first issue. The bigger babies have a heat plate, the grow outs have no heat. The antibiotic was 1 pill per gallon of water which is how I mixed it. Didn't give to the babies under 2 weeks. We use pymethrin and Demon insecticide but haven't sprayed since August. I may already have Corrid, I need to check in the barn. If not I can grab it in the morning. Thanks so much everyone for trying to help me, I really appreciate it

If its Coccidiosis tomoro too late. Whole barn floor needs disinfecting. Lives in the dirt.

 

[Kiki]

Lime is actually used to help rid coccidia from soil.
Coccidiosis video worth watching

 

[Cyprus]

Lime is actually used to help rid coccidia from soil.

I don't doubt it. It was just Hydrated Lime that was a concern because it is caustic.

 

[Elsveta641]

http://www.poultrydvm.com/condition/chicken-infectious-anemia
Considering the forms of transmition, ages of chicks affected, symptoms and sudden death I refer you to this site about Chicken Infectious Anemia (CIA)
It suspiciously matches almost every symptom and variable. Since it is spread both vertically and horizontally I would not be surprised if it was brought in from Goldfeather Farm's stock. And since they are a hatchery they likely would not have seen any of the effects.

I read it and it does sound like a distinct possibility. They haven't been particularly crowded or dirty, then again they seemed a bit I'll from the day they arrived

 

[Cyprus]

I read it and it does sound like a distinct possibility. They haven't been particularly crowded or dirty, then again they seemed a bit I'll from the day they arrived

To my understanding it can be inherited from the hens and passed onto the chicks to take effect while they are young despite conditions of housing.

 

[WVduckchick]

To my understanding it can be inherited from the hens and passed onto the chicks to take effect while they are young despite conditions of housing.

"cannot" or "can" ?

Wonder if this is something the lab will test for?

 

[Cyprus]

"cannot" or "can" ?

Wonder if this is something the lab will test for?

Can, sorry. Typo

 

[Elsveta641]

"cannot" or "can" ?

Wonder if this is something the lab will test for?

Even if they don't test for it specifically, you'd think the anemia and discolored bone marrow would get their attention and be noted

 

[WVduckchick]

Can, sorry. Typo

Thanks, just making sure

Even if they don't test for it specifically, you'd think the anemia and discolored bone marrow would get their attention and be noted

Yes, lets hope.
Wow, if this turns out to be the case, I wonder what Golden is going to say? But if it is, surely they are going to get other reports. I mean I think we all expect losses here and there, but whole flocks are definitely not normal.
I'm so sorry this happened to you.

On the silver side.... this could be very valuable help to others in the future.

 

[Evelyn's Mom]

sending prayers and hugs!!!