Outlines the link between genes and performance in farm animals shows tools for more effective genetic selection highlights the role and ethical implications of new reproductive and molecular genetic technologies. The application of scientific methods to animal breeding has led to major improvements in the output, cost and quality of animal products over the last few decades. This book describes the principles of genetic improvement of farm livestock and the practical application of these principles to dairy cattle, beef cattle and sheep breeding. This title has been taken over by CABI Publishing from Farming Press and was originally published in 1998.