It Must Be
ANDY ANDREWS
Lancaster Fanning Staff
MANHEIM (Lancaster Co.)
Wintertime is often synonymous
with respiratory concerns in
flocks. Poultry producers should
examine viable vaccination prog
rams as a result, according to a
poultry expert from the New Bol
ton Center.
Dr. Andre F. Ziegler, D.V.M.
and resident in avian medicine and
pathology at the University of Pen
nsylvania’s School of Veterinary
Medicine, spoke to about 36 pro
ducers and agri-industry represen
tatives on Monday at the Penn
State-sponsored Poultry Manage
ment and Health Seminar at Kreid
er’s Restaurant
Through the diagnostic period
November 1995 to February 1996,
working with the New Bolton Cen
ter, Penn State, and Summerdale
laboratories, Ziegler and other vet
erinarians have noticed a predict
able spike in the mortality pattern
■#4?W
Winter, Because Poultry Respiratory Concerns Abound
of birds that ate challenged by an
array of respiratory and other dis
eases during the winter season.
However, “most companies are
having minimal respiratory prob
lems, which is good news,” said
Ziegler.
Ziegler reviewed several disdct
poultry respiratory challenges.
One of them, laryngotracheitis
(commonly called LT), matches
the numbers of confirmed and sus
pected cases seen in the previous
year. “It's about the same as it was
last year for this period of time,”
said Ziegler.
But sorting the confirmed from
the suspected cases proves diffi
cult for a variety of reasons.
In confirmed cases, the labor
atories have been able to isolate the
virus or see the associated lesions
in the birds* tracheas. In suspected
cases, the labs cannot isolate the
virus and make their diagnosis
based on clinical signs, mortality,
and so forth.
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There have been three con
firmed cases ofLT in layers, two in
broilers, and (me in pullets. There
have been three suspected cases in
broilers and one suspected in pul
lets. Many of the confirmed and
suspected cases are located in vari
ous regions, but mostly north and
west of the city of Lancaster.
Symptoms of LT include a
noticeable “gasping for air” (also
called “drawback”) in the birds.
There’s a sound similar to a moist
cough and gagging. In severe
cases, according to Ziegler, “you
can actually see (the birds) flinging
blood from the trachea.”
When exposed, there are fibrin
ous “plugs” of material in the tra
chea, with bleeding throughout
Vaccination has been used. In
one case, there was a question of
the efficacy of a vaccine. When the
diluent was replaced with simple
distilled water, foe effficacy was
boosted from 90 minutes to the
recommended two hours.
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School of Vofotinary Madleina, Ml, apbkato about 36 pro
duoara and agri-industry rapraaantatlvaa on Monday at tha
Pann Stata-tponaorad Poultry Managamant and Haalth
Saminar at Kraidar'a Raataurant. At right la Dr. Barrett S.
Cowan, aaaoclata profaaaor of vataiinary acianca, Pann
Stata Wiiay Laboratory.
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Lancaster Farming, Saturday, FSbniary 17,1996-Al9
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Thursday Fobruary 22,1996 from
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24 Meadow Lane, PO Box 192, Paradise, PA 17562
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Another disease challenge has
been infectious bronchitis (IB).
“Infectious bronchitis is one (dis
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