I once worked in a chicken hatchery. There were essentially three jobs - packing eggs in incubating trays, cleaning the floors of the incubating rooms (if you were crap at the first, the second was a nightmare as so many eggs spilled). Third job was the most enjoyable - gassing the male or deformed chicks they didnt want. I was asked to find an alternative solution when someone forgot to restock the gas bottles. Ended up drowning them in a plastic barrel.
There was a fourth job which was actually sexing the newly hatched chicks but I hadnt learnt how to do that by the time I left to do a Masters Degree.
Unlike Piskie we were paid in cash although we also got a tray each of 4 dozen eggs once a week. Mine went straight in the bin.