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Yes this just about the right explanation, The poop gets squirted out ( just a tiny bit ) so the inside of the vent can be seen more clearly, looking for the bump, Thus helping sexing accuracy. It does not hurt the chick!!!!, It does not cause infertility!!!!!, It does not hurt egg laying!!!!. It is harmless to the chickens so you guy's dont go starting some crazy rumors. they say that at a place like Mcmurray those chinamen can sex about 20,000 a day, and that the only people employed to do this is a Chinamen, It has been passed down through the Eon's of time, they are very good at it.
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