Feed Strategy - April 2018 - 21
FeedStrategy ❙ 21
directed to immune cells, which use the energy to be able to
protect the organism. Protein concentrations are also modified.
Muscle loses proteins when the spleen and liver gain proteins.
Globular protein synthesis is, in fact, increased by inflammation. Here again, metabolism is reorganized, and the amino acids are redirected to immune functions. As an animal
eats less, it must use its protein stocks to assure immunity.
Each amino acid has it own metabolism. Tryptophan,
for example, is strongly impacted and research recommends that increasing feed content can neutralize it, but at
the same time lysine demand is lower. With methionine,
as with other sulfur-containing amino acids, it is used in
glutathione production and is one of the strongest antioxidants for animals.
In ruminants, energy demands are higher in cows with
mastitis when excess nitrogen decreases the phagocytosis ability of mast cells, said Gilles Foucras of the école
Nationale Vétérinaire de Toulouse (ENTV).
In conclusion, nutrients may play three roles regarding
inflammation: they may act directly as an anti-inflammatory; as a regulator of inflammation; or to repair the damage linked to inflammation.
If feed intake is limited during disease or stress, the
feeding strategy must be adapted to give the animals the
nutrients they need in higher concentration. ■
Editor's note: This article is based on conference session
presented by AFTAA, a French association for animal
production and nutrition sectors.
Yanne Boloh is a French freelance journalist and a
long-time contributor to WATT Global Media's feed
publications. She may be reached at phileas.info@
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