The current study described in details the process of bone development (Endochondral ossification) in the femur and tibia of Japanese quail during different stages of pre-hatching and post-hatching development. The study carefully investigated the most dramatic morphological changes during the growth of quail in a wide range of developmental stages starting from 5 days of post-fertilization, when the first leg bud was seen until 45 days of post-hatching, when the long bone was completely formed. The results in this book are unique and are considered a very important baseline for the understanding the theory of the long bone growth in quail and subsequently a better understanding orthopedic diseases affecting birds used for meat production. This work was from the PhD thesis of Ms. Soha A. Soliman, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt 2011-2013 and Supervised by Dr. Yasser A. Ahmed (Lectuerer of Histology), Prof. Gamal Kamel (Prof. Of Histology) and Prof. Salma Mohamed (Prof. of Anatomy) and Edited primarily by Prof. Mohamed Nabil Kamel (Prof. of Histology).