Poultry USA - September 2019 - 3

P OULT RY
H E A LT H
T O D A Y®

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A B O U T

P O U L T R Y

H E A L T H

P R O D U C T S
ISSUE

13

P O U L T R Y H E A L T H T O D A Y . C O M

toolbox

Tuning up live-vaccine priming for
infectious bursal disease and reovirus

An interview with

Kalen Cookson, DVM, MAM
Director of Clinical Research
Zoetis

"

Q: Why is live priming of breeder pullets for infectious bursal disease virus (IBDV)
and reovirus important?
KC: By initiating an immune response with live vaccines, pullets respond better and more
uniformly to the killed IBDV and reovirus vaccines they'll need later.

Naïve pullets that
become infected with a

Q: When should live primers be administered?

field reovirus...can shed

KC: Situations differ, but I generally recommend giving the first live IBDV and reovirus
vaccines between 2 and 3 weeks of age. Follow that with the second live primer for IBDV
at 4 to 5 weeks and for reovirus at 5 to 6 weeks.1

the virus vertically into
the egg [when they go
into production].

"

Q: Aren't most producers already providing live priming for breeder pullets?
KC: They are, and most understand it's not a good idea to rely on inactivated IBDV and
reovirus vaccines to provide a primary immune response. But there are opportunities to
do a better job with live priming, particularly when vaccinating to protect pullets against
variant reoviruses.
Q: How can live priming against reovirus be improved?
KC: It's fine to use a mild reovirus vaccine for the first dose in younger birds. But unless
that second dose is with a stronger vaccine, I've found pullets won't be protected from
variant reovirus challenges. In addition, you could end up with a subpopulation of
chronic carriers.
Q: What happens if birds are chronic reovirus carriers?
KC: Naïve pullets that become infected with a field reovirus probably won't develop clinical
disease. When they go into production, however, they can shed the virus vertically into the
egg. Then you've got broilers already positive for reovirus. That's another important reason
why proper live priming is so important. It protects pullets and progeny.
continued

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Poultry USA - September 2019

Table of Contents for the Digital Edition of Poultry USA - September 2019

Poultry USA - September 2019
Contents
Consumers: Sustainability is as important as welfare
Wet spring sparks fear of feed cost spike
Wayne Farms grows and diversifies in changing market
To control coccidia, control litter moisture
Global meat production to see largest ever decline in 2019
Identifying biomarkers for poultry intestinal health
In research and reality slower-growing birds cost more
Water: The first thing to take care of in poultry production
3 poultry technology innovations to watch
Product Review
Market Place
Poultry USA - September 2019 - CT1
Poultry USA - September 2019 - CT2
Poultry USA - September 2019 - Poultry USA - September 2019
Poultry USA - September 2019 - Cover2
Poultry USA - September 2019 - Contents
Poultry USA - September 2019 - Consumers: Sustainability is as important as welfare
Poultry USA - September 2019 - 3
Poultry USA - September 2019 - 4
Poultry USA - September 2019 - 5
Poultry USA - September 2019 - Wet spring sparks fear of feed cost spike
Poultry USA - September 2019 - 7
Poultry USA - September 2019 - 8
Poultry USA - September 2019 - 9
Poultry USA - September 2019 - 10
Poultry USA - September 2019 - 11
Poultry USA - September 2019 - Wayne Farms grows and diversifies in changing market
Poultry USA - September 2019 - 13
Poultry USA - September 2019 - 14
Poultry USA - September 2019 - 15
Poultry USA - September 2019 - 16
Poultry USA - September 2019 - 17
Poultry USA - September 2019 - 18
Poultry USA - September 2019 - 19
Poultry USA - September 2019 - 20
Poultry USA - September 2019 - 21
Poultry USA - September 2019 - To control coccidia, control litter moisture
Poultry USA - September 2019 - 23
Poultry USA - September 2019 - 24
Poultry USA - September 2019 - 25
Poultry USA - September 2019 - 26
Poultry USA - September 2019 - 27
Poultry USA - September 2019 - Global meat production to see largest ever decline in 2019
Poultry USA - September 2019 - 29
Poultry USA - September 2019 - Identifying biomarkers for poultry intestinal health
Poultry USA - September 2019 - 31
Poultry USA - September 2019 - 32
Poultry USA - September 2019 - 33
Poultry USA - September 2019 - In research and reality slower-growing birds cost more
Poultry USA - September 2019 - 35
Poultry USA - September 2019 - 36
Poultry USA - September 2019 - 37
Poultry USA - September 2019 - Water: The first thing to take care of in poultry production
Poultry USA - September 2019 - 39
Poultry USA - September 2019 - 40
Poultry USA - September 2019 - 41
Poultry USA - September 2019 - 42
Poultry USA - September 2019 - 43
Poultry USA - September 2019 - 3 poultry technology innovations to watch
Poultry USA - September 2019 - 45
Poultry USA - September 2019 - Product Review
Poultry USA - September 2019 - 47
Poultry USA - September 2019 - Market Place
Poultry USA - September 2019 - Cover3
Poultry USA - September 2019 - Cover4
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