The business of segregating males and females among day-old chicks by examining the rudimentary copulatory organs has become well established.
The sexing of chicks at hatcheries is carried on most extensively in the commercial layer operations.
Success in sexing chicks depends upon one's ability to distinguish the rudimentary copulatory organ or process, which is nearly always present in a well-developed condition in males but is nearly always absent in females.
A considerable amount of training and experience are needed to enable one to sex chicks with a high degree of accuracy at a fast enough rate to make the undertaking an economic success at most hatcheries.
So many chick sexers of Japanese origin use this method that is often referred to as the "Japanese Method" or called “vent sexing”.
By use of a special instrument, "proctoscope," it is possible to see the testes of male chicks through the intestinal wall of day-old chicks.
This method has been used successfully for day-old chicks and has the advantage of requiring less training and skill than the Japanese method.
Chick sexing is considered to be a hatchery service that must be routinely offered.
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