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I doubt three bumped their head playing and got injured. Were they exposed to your flock, or dust or dander from your flock before they were 2 weeks old? If so, you may have a different problem. Was it directly from the hatchery to you? Or from someone who claimed they were vaccinated? If they are about 6 weeks old, and then get wobbly, can't walk or aren't really eating, or eating and wasting anyway, it sounds like Marek's. Or something in their environment. Or coccidiosis.
Chicks were direct from hatchery to me in less than 2 days. Only thing different I have done this year was switch from shredded paper bedding to pine shavings. These chicks are the rowdyest birds I have ever owned. They are isolated in my house with only others from same hatchery within aerosol contact. They vocalize & then I removed them from cage being not normal. Are they bored & pick on the large crests because I had isolated them by themselves as they got too rowdy with the cochin bantams ?
None of what you describe sounds like a typical Polish problem. The ones with larger crests may be females and therefore weaker and more susceptible to whatever disease is hitting them. I also would vote Marek's first and coccidiosis second. If you have a poultry lab nearby, take the worst in for a necopsy.
Thanks for the input but I really don't think these birds are diseased. Neurotic maybe ,but not deathly ill. I just don't understand why this handful of standards are so rowdy compared to my other birds & my gentle bantam Polish. So maybe I just don't know how to make them happy. But I trimmed the crest on the "weak" one & it seems better so maybe vision obstruction was the problem as now it has a more upright stance & much more active. Possibly the lg crested got bulleyed & I wasn't watching close enough. Is it necessary to separate Polish males & females early on to avoid injury ?
I agree with cmsdvm mom. With Coccidiosis, they will look sick, hunched up, standing in one place. Marek's-they can look perfectly normal. I would change the feed and bedding, and see what happens.