Metodologías utilizadas para la medición de las pérdidas intestinales de nitrógeno endógeno en cerdos
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Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Amino acid ileum digestibility is one of the most important
factors to determine the nutritional value of
foods. However, the values obtained in ileum digestibility
tests can vary according to the endogenous
nitrogen losses in the animal. Thus, ileum digestibility
values can be classified as apparent or true. When
determining the apparent value, endogenous nitrogen
losses are not taken into account and the
amounts of absorbed amino acid during digestion are
then underestimated. When the endogenous component
is taken into account, digestibility data become
true, being the best parameter to represent absorbed
amino acid in the digestive tract. Endogenous nitrogen
losses are classically defined as the nitrogen
found in the digesta or in the feces of animals fed
with nitrogen-free diets. Traditionally, endogenous
nitrogen losses in pigs have been determined by feeding
nitrogen-free diets or by the lineal regression
method. More recently, several alternative techniques
have been developed to evaluate endogenous nitrogen
losses in pigs that are fed with diets that contain
variable protein levels. Each of these techniques has
some limitations and all require different assumptions.
Based on the increasing number of results recently
obtained with different techniques, endogenous nitrogen
losses seem to be highly affected by the used
method and by factors as weight, dry matter consumption,
and diet components (anti nutritional factors, fiber
and protein)
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Keywords
Corporación Universitaria Lasallista, Digestibilidad ileal, Digestión, Cerdos, Cerdos - Crecimiento, Cerdos - Nutrición, Cerdos - Alimentación y alimentos