This document provides an outline for a course on principles and practices of animal breeding. It begins with an introduction and definition, then covers the history of animal breeding and its importance in Nepal. It discusses traits of economic importance for various indigenous livestock species in Nepal including cattle, buffalo, goat, sheep, pig, and poultry. It also covers the importance of conserving animal genetic resources. Other topics include genetic variation and heredity, selection methods and systems, inbreeding, crossbreeding, and nucleus breeding systems.