Poultry is one of the most highly economic bird on allover the world. Poultry considers source for protein production that gain much attention from many populations. The development of their male reproductive organs is of great concern to poultry breeders due to its main great role in poultry production and fertility. Only few studies were demonstrated on the pre and post-hatching stages of the testis and its male genital tract on the domestic fowl from the developmental and immunohistochemical perspectives. Therefore, this book participate to filling the gap in the knowledge by giving complete overview on the morphogenesis of testis and male genital tract in fowl during the pre and post-hatching life by using different histological and immunohistochemical techniques. Moreover, this book will provide more understanding for researchers who deal with the organogenesis of the chick embryo and poultry reproduction.