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https://www.thepoultrysite.com/articles/are-fumonisins-a-real-threat-to-the-poultry-industry According to the above article the acceptable level Fumonisin is much higher in Europe versus the U.S. 20mg v.s 2mg per kg of weight of livestock. Some use an active clay ( such as bentonite) in the...

Ok so a potential feed related culprit could be Fumonisin contamination of feed, it is a group of mycotoxins that infect cereal grains. It causes stunted growth, rumpled and reduced feathering, and has a mortality rate of about 12%. Lead exposure in the breeding stock can also can cause some...

Okay looking into journals and studies that are freely available doesn't yield a ton of current information. This is a link to an old paper from the late 60s regarding crooked neck and dwarfism morphs. I'll go log into my university library and see if I can access more recent information, the...

Wry neck can be due to vitamin deficiency, but it's not always the cause. I would suspect excessive inbreeding or perhaps just a very poor diet in the breeding stock. I have been searching for similar situations to yours, it seems most only have a single bird with stunted growth, not the entire...

I would think something genetic related at this point. Wry neck is often a neurological issue. Where did you source your birds?