The method of turning the anus for sex identification of chicks

Among the various methods of sex identification of chicks, anal identification method is the most widely used in production because of its accuracy and reliability. Its principle is: in the early stage of the chick, the reproductive process can be seen at the opening of the cloacal cavity of the male chick, which is about 2mm long, the surface is tense, elastic, the hand pressure is not easy to deform, shiny, and the outline is distinct; the opening part of the cloacal cavity of the female chick is generally sterile, even if there are residual reproductive protuberances, it is more atrophic, soft, inelastic, no luster, and the hand pressure is easy to deform.

The best time for identification is 12 hours after the hair is dry, when the difference in the shape of reproductive process between male and female chicks is the most significant. Early identification shows that the chicks are soft, not easy to turn the anus, and have a great impact on the chicks; turn the anus too late, the reproductive process changes, the identification is not easy, and the anus is not easy to open, too much force is easy to cause harm to the chicks.

The operator clamps the neck of the chicken with the middle finger and ring finger of the left hand, gently presses the abdominal defecation with the thumb of the left hand, places it on both sides of the cloacal cavity with the right thumb and index finger, and gently opens the cloaca. If there is a spiral protuberance at the mouth of the cloacal cavity, it is a rooster, and if it is a triangular valve fold, it is a female chick.