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Just have a few minutes. The width of back and length of back are all structural and will only grow to what they are hatched with. I would never try and determine on a baby chick if it has either. By the 4-5 month age you should be able to tell Width of chest and width of back and length. When you get a group together it is real easy to spot the narrow. Best advice for you still yet is buy the Morley Jull book.
Just have a few minutes. The width of back and length of back are all structural and will only grow to what they are hatched with. I would never try and determine on a baby chick if it has either. By the 4-5 month age you should be able to tell Width of chest and width of back and length. When you get a group together it is real easy to spot the narrow. Best advice for you still yet is buy the Morley Jull book.