Egg Industry - October 2019 - 8

8 ❙ EggIndustry
EFFECTIVELY CONTROL SALMONELLA
affected flocks, generally white egg
layers. Some farms seem to have a
higher incidence, and veterinarians
are not able to link the problem with

a specific manufacturer's bacterin.
Some reports include clinical signs
such as lame birds, diarrhea and
convulsive-type movements.

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The most observed lesion is a
liver that becomes enlarged, mottled
in color and breaks down easily,
resulting in hemorrhaging. Free
blood can be found in the intestine.
Even when the bacterin is given
intramuscularly in a hen's thigh,
liver lesions are most common,
which removes the theory of
improper bacterin administration as
the cause of the liver lesions.
Clear answers are still eluding field
veterinarians and researchers as to
the source of this syndrome. Possible
causes include high endotoxin levels in
bacterins, overheating of the bacterin
before administration or possibly an
auto- or hyper-immune response.
While there are more than 2,500
serotypes of Salmonella reported
around the world, fewer than 100 are
responsible for most human infections. However, there is still much
to be learned about those serotypes,
their presence in poultry and their
ability to contaminate eggs and egg
products. Producers need to use all
available tools to reduce Salmonella
infections in layer flocks. Vaccination
will continue to serve an important
role in those efforts. ■
Jerry Dreyer has worked in
the poultry industry in global
marketing and sales roles in
animal health and genetics
companies. He now assists
clients with market and product
development, communications,
research and marketing projects.
JerryKDreyer@gmail.com.
www.WATTAgNet.com ❙ October 2019


http://www.poultryhealthusa.com http://www.WATTAgNet.com

Egg Industry - October 2019

Table of Contents for the Digital Edition of Egg Industry - October 2019

Egg Industry - October 2019
How layer vaccination can effectively control Salmonella
Rose Acre facility redesign emphasizes food safety
Positioning hard-boiled eggs in the snacking market
Egg Industry - October 2019 - CT1
Egg Industry - October 2019 - CT2
Egg Industry - October 2019 - Egg Industry - October 2019
Egg Industry - October 2019 - Cover2
Egg Industry - October 2019 - CT3
Egg Industry - October 2019 - CT4
Egg Industry - October 2019 - 3
Egg Industry - October 2019 - How layer vaccination can effectively control Salmonella
Egg Industry - October 2019 - 5
Egg Industry - October 2019 - 6
Egg Industry - October 2019 - 7
Egg Industry - October 2019 - 8
Egg Industry - October 2019 - 9
Egg Industry - October 2019 - Rose Acre facility redesign emphasizes food safety
Egg Industry - October 2019 - 11
Egg Industry - October 2019 - 12
Egg Industry - October 2019 - 13
Egg Industry - October 2019 - 14
Egg Industry - October 2019 - 15
Egg Industry - October 2019 - 16
Egg Industry - October 2019 - 17
Egg Industry - October 2019 - 18
Egg Industry - October 2019 - 19
Egg Industry - October 2019 - Positioning hard-boiled eggs in the snacking market
Egg Industry - October 2019 - 21
Egg Industry - October 2019 - 22
Egg Industry - October 2019 - Cover3
Egg Industry - October 2019 - Cover4
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