Pig International - July/August 2017 - 27
PigInternational ❙ 27
Factors affecting the epidemiology of Salmonella infection in pig
Variability of the
infection among batches
Influence of other diseases
(PRRS,Dysentery, Ileitis, etc.)
Factors influencing the
epidemiology of Salmonella
Wide range of host
Survival in the environment
■ Feral pigs
Carriage by pigs
formation of biofilms
■ Survival in fecal or organic material
■ Presence in feed ingredients (such as soya)
Carriers and chronically infected
pigs can shed Salmonella
at any stage and are potential
transmitters of the infection.
The complex epidemiology of the pathogen limits the efficacy of any control intervention applied.
in some others, the intervention failed. Why do we
have these divergences in effectiveness? Are organic
acids thus useful to the control of Salmonella? The answer is yes, but under certain conditions.
Factors that affect the efficacy of
organic acids against Salmonella:
■ Acid used: Not all the acids have the same effect.
Research studies highlight that butyric, propionic
or formic acid effectively reduce Salmonella levels
while the same or other studies point out that other
acids, principally acetic acid, have no beneficial effect against Salmonella.
■ Presentation: Commercial products usually encap-
sulate the acid or mix of acids included in the formulation. Some of these products also include other
compounds, such as essential oils, other antimicrobials, etc. The inclusion of these compounds and the
encapsulation may boost the effect of the product.
■ Concentration: The higher the concentration, the
better the results. For instance, a study combining formic-propionic acids was effective reducing
Salmonella shedding in feed when the product was
Read more: Using plant alkaloids
in swine feed against Salmonella,
KEEPING HEALTHY, THE NATURAL WAY
A natural source of choline activity.
A formulation of free and puriﬁed nucleotides which
improve the immune systems' performance.
Nutritec International Sarl.
La Romanèche 13
Cost-effective natural methionine recycler which
allows a partial replacement of dl-methionine.
CH1163 Etoy VD
+41 21 807 24 28 (corp. Ofﬁce)