ARS Says Exposure to Marek's Does Not Work
Natural exposure as a strategy
to protect young chickens against
Marek’s disease (MD) just does
not work. -
In some poultry-growing areas
it has become a common practice
to put old 'litter with baby chicks
under each brooder stove or to
place a few old hens in with the
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chicks. It is usually hoped that
this “controlled” exposure will
reduce later outbreaks of MD, a
tumorous disease.of chickens.
The practice was tested toy
ARS poultry scientists H.
Graham Purchase, William
Okazaki, and Ben R. Burmester
at the Regional Poultry Research
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Lititz - Manheim Township - Millersville - Rohrerstown
Lancaster - Centerville - Lancaster East * Landisville
Laboratory, East Lansing, Mich.,
and Marius lanconescu, formerly
with ARS.
In two experiments litter was
used for the exposure and, in
one, a number of adult birds.
Chicks were raised either on
the farm or in isolation. Resis
tance acquired from expdsure
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was challenged with injections
of Marek’s disease virus or
contact exposure from chickens
with Marek’s disease. The natu
ral exposure should cause anti
bodies to be produced. The
chicks would thus develop resis
tance and be protected from sub
sequent infection.
Words and Music by Steve Karmen
© 1971 Sandlee Publ. Corp., Rockville Centre, L.L, N.Y, 11570
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Results indicated that farm
reared (exposed) birds were as
prone to MD effects as chickens
raised in isolation.
“The presence of actively ac
quired antibody does not confer
any significant degree of protec
tion against MD,” the scientists
concluded.
Since birds raised in isolation
showed the same age effect, re
duced susceptibility could not
be attributed to natural exposure.
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