The peri-natal period (the last three days before hatch through the first three days after hatch) is most critical for development and survival of commercial broilers. In ovo feeding and neonatal nutrition (Post hatch supplementation) can help support the bird during transition from embryo to independent food supply and enable the modern broiler chick to achieve its full genetic potential for growth. Topics covered under this book added scientific knowledge in field of peri-natal nutrition for commercial broiler.