Overview

This book is written with the objective of bringing together knowledge in the sciences of microbiology, physiology, metabolism and feed evaluation pertaining to the energy nutrition of ruminants. In the first part the nutrition of the newborn and development of microflora are discussed. Two chapters are devoted to rumen microbiology and control of fermentation, with emphasis on factors which can enhance or inhibit the efficiency of fermentation. The absorption of volatile fatty acid and its utilization for various processes are discussed in two chapters. Four chapters are devoted to the energy necessary for different functions and control of roughage intake and food evaluation. In the book it is argued that the type of rumen fermentation has little or no effect on energy nutrition and utilization, and that differences in utilization between roughages and concentration can largely be explained by the difference in activity, such as time spent eating and ruminating. It is also argued that the fasting metabolism should not be used as a basis for assessment of food utilization. A new feed evaluation system is suggested: it is based on the dynamics of feed degradation, and also predicts food consumption. It is argued that present feed evaluation systems have little relevance in production systems based on poor quality roughage in which voluntary intake is of paramount importance.

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9781851664399

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