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Every time that the female lays a egg, the male goes and does a small hole at egg. Does anyone knows why?

This is first time hatching emu. I set 17 eggs. I read the threads Emu Hatch-a-long 2012 and Emu Hatch 2013 by yinepu, so i hope get good result. Last year hatched 15 ostriches by homemade incubator.