You can do this at home, but be very careful, as you can easily hurt the chicks. Determining Sex in Chicks by Don Schrider from the June/July, 2011 issue of Backyard Poultry - Backyard Poultry Magazine
(This would work for pets also.) homemade chicken waterer- so stinking simple and smart! (Wonder if you could do the same thing with a large "Gatorade" cooler and give your hens cool water in the summer.