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This book is intended to be a companion volume to 'Protein
Nutrition in Ruminants' (1982, Academic Press), which emphasized
both the role of proteins and new systems for their evaluation.
Here the focus is on energy-yielding nutrients and problems
involved in evaluating them. Nonetheless in both volumes there is
explicit recognition of the interdependence of energy and protein
nutrition. I have not attempted to review comprehensively all the
literature relating to ruminant energy nutrition and must apologize
to colleagues whose work is not fully reported. Where possible
tables and figures are taken from the studies of our group at the
Rowett Research Institute since, if for no other reason, I am most
familiar with these data. I have first considered the nutrition of
the newborn and have stressed the role of behaviour 'in determining
whether nutrients enter or bypass the rumen. The development of the
rumen, the of anaerobic fermentation and the roles of various
principles . species of rumen bacteria, protozoa and fungi in
relation to different substrates, are summarized. This is followed
by accounts of the factors affecting the utilization of different
substrates and the v vi Preface absorption and metabolism of the
end-products of fermentation and digestion, together with estimates
of digestive capacity in various segments of the gut. The
ruminant's requirements for energy-yielding nutrients is considered
in relation to the per formance of various activities and to
environmental conditions, particular attention being paid to the
requirement for glucose precursors.
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