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This 1973 volume reports the proceedings of a 1971 symposium considering the relative biological efficiency of alternative methods of protein production by plants and animals.
The greatest challenge of our time is to produce sufficient food ot keep pace with the rapidly growing population. In the opinion of experts, during the next 25 years there will be a need for as much food as was produced in the entire history of mankind to date. Of the various measures available, improvement in agricultural productivity is judged as the ultimate means of augmenting food production and supplies. In this Handbook, an international team of experts consider the most important factors affecting production of both crops and livestock. This Handbook is intended as a scientific guide to practitioners and students, as well as to researchers, who should find here stimulating ideas for further exploration.
It would have been very easy to expand on all the sections of the first edition but I decided to try to retain the relatively short, introductory nature of the book. Some new material has been added, particularly where it has been possible to update data, and there has been some change of emphasis in places, in order to reflect changing world conditions. The book retains its original purpose, however, of introducing systems thinking as applied to agriculture. I am grateful to Angela Hoxey for help in preparing this edition, especially in relation to the preparation of tables and figures. C. R. W. SPEDDING v Preface to the First Edition The agricultural systems of the world represent a very large subject. Their study involves a great deal of fairly detailed knowledge, as well as a grasp of the structures and functions of the systems themselves. This book has been written as an introduction to such a study and it concentrates on an overall view, rather than on the detail, partly because of the need to relate the latter to some larger picture in order to appreciate the relevance and significance of the detail. This problem-of seeing the relevance of component studies and the significance of physical, biological and economic detail, and indeed principles-is encountered by many agricultural students right at the beginning of their university careers.
This comprehensive handbook provides information on history, breeds and genetics, statistics, animal health, production, product utilization, and future projections.The focus is on large, domestic animals, but small animals are also covered. References are provided which will lead the reader to specialized subject areas. Each broad cross-section is written by respected authorities in the field.This is a handy and convenient animal reference source for teachers, graduate students, and researchers in the fields of animal science, agricultural science, and food science and technology.
Meat provides an introductory review of the meat-eating habit in man and covers the production, preservation, composition, eating quality, human nutrition, and assessment of the future role of meat. Meat continues to be a major food commodity. Despite the high cost of production of meat animals and their lower efficiency of protein synthesis compared with that of plants and micro-organisms, meat is likely to be important in the human diet for as long as can be foreseen in the future. This book intends to emphasize the fact that the sequence of events, from the conception of meat animals to their incorporation in the human diet, is continuous. The properties of the commodity when eaten are influenced, in the nature and degree of their expression, by all the earlier components in this chain of circumstances. This text is a useful reference for students conducting research within the fields of agriculture science, biochemistry, and nutrition.
The nutritional quality of a protein depends on the proportion of its amino acids-especially the essential amino acids-their physio logical availability, and the specific requirements of the consumer. Availability varies and depends on protein source, interaction with other dietary components, and the consumer's age and physiological state. In many foods, especially those from plants, low levels of various essential amino acids limits their nutritive value. This is particularly important for cereals (which may be inadequate in the essential amino acids isoleucine, lysine, threonine, and tryto phan) and legumes (which are often poor sources of methionine). Moreover, these commodities are principle sources of protein for much of the earth's rapidly growing population. At the current annual growth rate of about 2 percent, the world population of about 4 billion will increase to 6.5 billion by the year 2000 and to 17 billion by the year 2050. Five hundred milliQn people are presently estimated to suffer protein malnutrition, with about fifteen thousand daily deaths. The ratio of malnourished to adequately nourished will almost surely increase. For these reasons, and especially in view of the limited availability of high quality (largely animal) protein to feed present and future populations, improvement of food and feed quality is especially important.
First multi-year cumulation covers six years: 1965-70.