SWINE RESEARCH SNAPSHOT
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Are non-essential amino acids "essential" for optimal health in swine?
High protein diets increase
Diets formulated to meet
essential amino acid (AA)
Limited research on non
essential AA in low protein
Glycine, a non essential AA
may limit growth
Glycine participates in DNA,
RNA, and collagen synthesis
Feeding low crude protein diets reduces nitrogen excretion
into the environment (i.e. in urine and feces) meaning that it
can reduce the impact of pork production. However, low
protein diets reduce non-essential AA content in the diet and
this can be a problem since non-essential AA can improve
processes other than growth performance in swine such as
the synthesis of collagen.
NON ESSENTIAL VS. ESSENTIAL AMINO ACIDS
Non essential AA are defined as AA that can be produced
within the body therefore they do not need to be added to a
diet. On the other hand, essential AA are required in the diet
since the body cannot make enough of them to support
growth and other body processes. In low protein diets,
Glycine endogenous synthesis may not be enough to keep
up with body processes and may limit growth in swine.
Glycine content in the diet did not change initial or final body
Diets with 100 and 60 % estimated requirement of Glycine
content (CON and LT) had improved skin collagen compared
to the other diets (Figure 1).
Who said non-essential amino acids are not important in