Since my hens have been laying I had been feeding them a 50/50 blend of Purina Flock Raiser and Purina Layena, I would then supplement with a couple table spoons of oyster shell right into the feed every day. Always figured the extra protien of the Flock Raiser gave them a little boost, and even if it didn't I felt good about feeding it to them. Well the first of May I decided to "simplify" things. Went to straight Layena. Egg production is off by a full 50%. Monday morning bright and early off to TSC I go to get me a bag of Flock Raiser.