Looks like wry neck, a thiamine B1 or niacin B3 deficiency. You need to get some brewers yeast on the feed and some multi vitamin or polyvisol .
http://www.thepoultrysite.com/publications/6/diseases-of-poultry/216/vitamin-bi-deficiency
http://www.thepoultrysite.com/publications/6/diseases-of-poultry/216/vitamin-bi-deficiency
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