This document discusses reasons for culling livestock, including poor production, reproduction, growth, genetic defects, incurable illness, and age. It provides specific criteria for culling dairy cattle based on milk production, age over 9 years, and dairy characteristics. For poultry, reasons include poor laying, production, and reproduction, as well as age over 30 weeks. Physical signs of good versus poor laying hens are described. Culling sheep may be due to poor production, reproduction, growth, infections, age over 5-6 years, or abnormalities.