WATT PoultryUSA - October 2015 - 33

P O U LT R Y H E A LT H TO DAY.CO M

Pathways to protection

administered in ovo. HVT helps protect against Marek's and
serves as a vector to help provide protection against one of
three other costly diseases - infectious bursal disease (IBD),
infectious laryngotracheitis (ILT) or Newcastle disease (ND).
Though more expensive than traditional vaccines, the
recombinant vector vaccines are popular with broiler
producers because they're easy to administer and offer a
high margin of safety, with virtually no reactions that can
impede flock performance.

Soup's up!
It's hard to talk about vaccines without serving a
bowl of alphabet soup. Here is a key to vaccine
and disease abbreviations used in this article,
presented in alphabetical order.

The only hitch: Not more than one HVT vaccine, whether a
recombinant or not, can be used at the same time because
they will compete with each other and become less effective.
That means producers fire only one HVT bullet, so to speak.
If they use an HVT-based recombinant to help protect flocks
against IBD, that rules out using one for ILT and ND. Likewise,
if flocks receive an HVT-based vaccine for ND or ILT, producers
will need to resort to other types of vaccines for the other
two diseases.

Choosing your weapon
So, if broiler farms get only one shot with an HVT-based
recombinant, which disease should they target?
It really comes down to disease pressure, time of year and
other vaccination options. Keck recommends using lab testing
and physical evidence of disease damage as a starting point.
"You want to find the recombinant that'll deliver the most
value in each particular situation," he says. "Then use traditional
vaccines to manage the other major diseases."
Here's an overview of four different vaccine scenarios for
broilers, with and without recombinants:
continued

Photo: Kalen Cookson, DVM, MAM, and Lloyd Keck, DVM, ACPV
Photo by Joseph Feeks

SPECIAL ADVERTISING SUPPLEMENT

C2
CEO
FPV
GA 08
HVT
IBD
IB
IBV
ILT
ND
NDV

Non-reactive, cloned strain of B1 NDV
Chicken-embryo origin
Fowlpox virus (used to make
some recombinants)
Georgia 2008 variant of IBV
Herpesvirus of turkey (used to make major
recombinant vaccines for IBD, ILT and ND)
Infectious bursal disease
Infectious bronchitis
Infectious bronchitis virus
Infectious laryngotracheitis
Newcastle disease
Newcastle disease virus



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