Here is a project for all you 4-H ers. A 90 something young lady told me she could hatch mostly hens, 95+%. She said her Father did it to keep the rooster rate down. Then today she came at me with a copy of Mother Earth News dated May 2001. Read this article she said, which I did and it said the same thing she has been telling me. This is the article. Rooster Detection Although I raised chickens for many years, I never knew this helpful hint until my farmer neighbor told me. When your hen is setting on eggs in her nest and you don't want any new roosters around, remove any eggs that come to a point. These are the male eggs. Let the hen hatch only the rounded ones and they will all be females--no roosters in that hatch. Article by Joyce Hamilton Cherokee Village, Arkansas So the next time you use your bators, try keeping all the pointed eggs in one and rounded eggs in the other and see if this works.