In this book, the authors present current research in the study of the physiology, diseases and farming practices of chickens. Topics discussed include recent trends in the diagnosis and vaccines for poultry diseases; nutrient regulation of intestinal development and function in chickens; the role of selenium in chicken physiology; harvest and post-harvest practices for chickens; organ blood flow in the hen foetal and early postnatal periods; central regulation of physiological and metabolic responses in neonatal chicks; bacteriophages in the control of colibacillosis; and chicken egg size and embryonic development.