Egg Industry - March 2016 - 5

EggIndustry ❙ 5

The goal is for the house temperature to exceed
104F within 30 minutes and to hold the temperature
for three hours. Achieving a relative humidity of 75
percent or higher is also desired. Water for the birds to
drink is not turned off and circulation fans within the
house maybe used to help equilibrate the temperature
throughout the house.

Indiana avian flu outbreak
The U.S. poultry industry didn't have to wait
long to test the USDA's decision tree for ventilation
shutdown. On January 15, 2016, a farm with more
than 60,000 tom turkeys in Indiana was confi rmed
to be infected with a highly pathogenic H7N8 strain
of avian flu. Within days, nine other turkey farms
were determined to be suspect for avian flu and were
tested. These farms were all determined to be infected with a low-path strain of H7N8 avian flu.
Dr. John Clifford, USDA chief veterinary officer,
said: "It appears that there was a low-pathogenic virus
circulating in the poultry population in this area, and
that virus likely mutated into a highly pathogenic virus
in one flock."

Mass depopulation of large
layer houses cannot be
completed in 24 hours using
currently recognized-ashumane methods.

March 2016 ❙

There are 124 commercial poultry farms within
a 20 kilometer radius of the index site in the Indiana
outbreak, according to Denise Derrer, public information director, Indiana State Board of Animal
Health. She said that, because of the close proximity
of other farms, and the fact that nine other turkey
farms tested positive for avian influenza, ventilation
was restricted in the poultry houses on all the farms
after testing positive.
Eight of the turkey farms and one layer flock were
euthanized using foam.  Derrer reported that, because
of cold temperatures, the foamers didn't work on two
of the turkey farms. Ventilation shutdown was employed so that these two turkey farms could be depopulated without delay.
As of mid-February, there have been no subsequent
findings of avian flu.

The case for ventilation shutdown
Dr. Eric Gingerich, technical service specialist,
Diamond V, addressed the committee on transmissible diseases of poultry and other avian species at the
United States Animal Health Association's 2015 annual meeting in Providence, Rhode Island, in October
on the topic of ventilation shutdown. He said there are
other reasons for deciding to use ventilation shutdown
besides the reduction in shedding of virus. Ventilation
shutdown also greatly reduces the time of exposure
of the workers depopulating flocks using standard
methods to possible zoonotic agents, and it reduces
the amount of birds suffering from the disease during
slower depopulation methods, he reported.
Gingerich said: "It is agreed that ventilation shutdown is not the ideal method for mass depopulation
as it results in longer periods of time for suffering
compared to other methods. The decision to use ventilation shutdown is only to be made after all other more
humane methods have been considered and it has been
determined that the time taken for other methods will
allow the amount of virus to become excessively high
and results in undue spread of the disease."
The American Association of Avian Pathologists, at
its annual meeting in summer 2015, approved a position

Table of Contents for the Digital Edition of Egg Industry - March 2016

Egg Industry - March 2016 - Cover1
Egg Industry - March 2016 - Cover2
Egg Industry - March 2016 - 1
Egg Industry - March 2016 - 2
Egg Industry - March 2016 - 3
Egg Industry - March 2016 - 4
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Egg Industry - March 2016 - Cover3
Egg Industry - March 2016 - Cover4