As avian flue prevention, slaked lime has been used. We considered the need for daily use to prevent avian flue, and developed new type of lime, “squire type slaked lime, granulated lime 75”. Slaked lime is difficult to spray because of powder, but granulated lime 75 is easy to spray because of granularity. Granulated lime slowly breaks its form, so the effectiveness of flue prevention lasts long time.