Several methods are used to determine the sex of a day-old chick. The Keeler Optical English or Chicktester Japanese machine features a blunt-ended telescopic tube, containing a light. With all these breeds, the chicks with the most distinct indicators can be sexed with confidence, while the others cannot. Some are effective only with certain breeds or crosses, while others are universal. Most males have a relatively prominent eminence, most females have none. When learning to sex chickens, it is best to assume that chickens with small eminences are female.
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