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The NILGS has developed a novel method for sexing day-old chicks using an endoscope system. In this method, the probe of the endoscope is inserted from the cloaca into the intestine of a chick, and the presence of testes or ovary can be observed through the wall of the intestine and clearly viewed on a computer monitor. An overall accuracy of 90.2% was obtained in the present study which could be improved by continuous training in the handling of the endoscope. Furthermore, this endoscope system is not only very efficient but is also easy to use and requires no specific skills for simple operation or about 1 or 2 weeks for more precise sexing. Read more.