The objective of compilation of this Reference Book is to provide the guidelines on the basic principles of Veterinary Physiology of Growth, Environment and Climatology. The information pertaining to the change in the climate and environment affecting the animal Growth with special reference to the Prenatal and Post natal in the domestic animals. The extremes of the climatic variations and environmental changes leads to the loss in the animal productivity and reproduction. The detailed descriptive information about, how the animals adapt to the extremes of the climatic and environmental variations physiologically is included in this book.