It’s if you want to know which chicks hatched from which eggs, if all the the eggs look very similar. For example if I want to know which chicks came from which of my hens, assuming I can tell their eggs apart!Also if you have chicks from different breeds that all look similar than you can tell which ones are which. Hope this makes sense! Example is when I was hatching Polkies and Silkies, which look almost identical at hatch, and I wanted to make sure I was selling the right chicks to the right customer.
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I had a few hatch at night and I wouldn’t have known which egg they came out of!
By the time they're dry they've moved around so much in the incubator that I have no idea what egg they came out of.