Or did you use the Decision Maker 2000 to come up with that number?
Unless your chicks are indeed all -uhm- female, you may have 2000 sleepless nights per year instead. Probability on 8 roosters among 8 unsexed chicks is (1/2)^8 = 1/256, says Newton.
Sexism is a bitch, I know. It's the roosters that will face the pan, the hens will receive the lavish treatment. It sucks to be male sometimes.
if you have too many roosters you can always...