The previous edition of this book (published in 1994 with the title Amino Acids in Farm Animal Nutrition) was well received by academic and commercial users and by critics undertaking reviews on behalf of international journals. Citation of individual chapters in various research publications has also been a source of considerable satisfaction.

Amino acid metabolism and nutrition of farm animals continues to be an active area of research, with new data now widely published in proceedings of international conferences and in journals. A new edition would, therefore, be justified for this reason alone. However, in addition, there is a need to take into account advances in the amino acid nutrition of a wider range of animals, including companion animals. There is also a need to address changes in focus and to recognize the efforts of new scientists in the field and the role of our commercial colleagues. I am now able to offer an enlarged version with the not too dissimilar title of Amino Acids in Animal Nutrition.

In this new edition of Amino Acids in Animal Nutrition, I have attempted to retain chapters imparting strength to the first version, while introducing authors with new ideas and vision. I have also addressed comments I received from external reviewers, chiefly to do with overlap. The book is thematically structured. Part I includes chapters of an introductory and general nature with applications to a wide range of animal species. The next four parts are species-related sections, including pigs (Part II), poultry (Part III), ruminants (Part IV) and other animals (Part V). The chapters in the final section (Part VI) cover applications and perspectives. A unifying theme emerging from these sections is the improved outlook for pure amino acids, against a backdrop of restrictions in the use of protein feeds from animal sources. Another noticeable feature of recent work is a significant shift from empirical supplementation studies to fundamentals such as signalling and molecular aspects. As ever, methodological innovations are the key to improved understanding of the amino acid nutrition of animals; examples of recent advances will be found throughout all sections of this book. Comparative issues are given greater prominence in the new edition compared to the earlier version. The aim continues to be to improve exchange and integration of information across the species barrier. Many excellent reviews on different aspects of protein and amino acid nutrition have appeared since the publication of the first edition. For example, two reviews on the measurement and significance of protein turnover and inter-organ amino acid flux recently appeared in the book entitled Farm Animal Metabolism and Nutrition published in 2000 by CABI Publishing.

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