Airsacculitis decreases egg production
UNIVERSITY PARK - sac c„l it is, an infecUon
Pennsylvania poultrymen causing moderate to severe
can eliminate sudden and reduction in eggs
costly drops in egg “The stress of high egg
production by inoculating production opens the way for
laying hens against air- airsacculitis to take its toll,”
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explained Dr. Robert F.
Gentry, veterinary scientist
at Penn State University.
The inoculation prevents
infection only when it is
impractical for poultrymen
to clean and sanitize
buildings thoroughly. Dr.
Gentry said. Complete
sanitation and isolation is
still the best practice for
controlling the infection, he
added.
He reported that one
poultryman with 30,000 hens
received $20,000 more in 24
weeks with inoculated hens
than from a previous flock
that was not inoculated. He
said Pennsylvania is the
fourth leading state in in
come from egg production.
“Egg producers with
many large poultry houses
close together find it
physically impossible to
clean and sanitize all the
houses simultaneously or to
raise several hundred
thousand pullets
simultaneously,” he stated.
The inoculation exposes
laying hens to a culture of
the so-called F-stram of
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airsacculitis. This produces
a mild reaction but gives a
strong immunity, Dr. Gentry
claimed. He said the
inoculum is being used
extensively to control the
infection on poultry farms
with multiple-aged hens.
A Commonwealth
program for inoculating
hens has been developed in
co-operation with the
Pennsylvania Bureau of
Animal Industry. The proper
amount of inoculum - 100
milliliters of F-strain culture
per 1000 hens - is dispensed
to the flock with a portable
sprayer. The spraying is
done by servicemen from
feed companies and similar
businesses.
“Slight respiratory
reaction may be observed
but it lasts only a few days
Surface applied nitrogen
may increase soil acidity
FAIRFAX, Va. - Proper
soil management to control
soil acidity, which results
from surface-applied
nitrogen fertilizer, is an
important production factor
m continuous no-tillage corn.
“The importance of lime
with reduced tillage should
not be overlooked” says
lowa State crop fertilizer
specialist, Regis Voss. Most
lime recommendations and
related research in
formation for effective row
crop production suggest
plow-down application.
Therefore, with the growing
popularity of no-tillage
systems, the effectiveness of
surface-applied and unin
corporated lime has become
a question of concern to
many. Much research has
shown that soil surfaces
become quite acid after
several years and no-tillage
production.
Recently, studies have
been conducted by
Agronomists at the
University of Kentucky
concernmg this question of
Lancaster Farming, Saturday, May 27,1978
and the hens are then
resistant or immune to
further infections. The
immunity is confirmed by
blood tests,” he stated.
Such immunization has
increased egg production by
as much as 10 per cent for
the entire laying period
when no other infections
were encountered. The
average increase has been
near five per cent, even
where other problems were
found in some flocks.
Inoculation of hens for
airsacculitis is among the
features m the Spring issue
of “Science m Agriculture,”
the quarterly magazine of
the Agricultural Experiment
Station at Penn State. In
terested persons can get on
the mailing list free by
writing to Director,
Agricultural Experiment
this effectiveness of surface
lime applications against the
acid-producing effect of
nitrogen fertilizers. They
discovered that, because the
greatest portion of the acid
producing effect is con
centrated m the soil’s sur
face under the no-tillage
system, neutralization of the
acid condition is made
easier. They concluded that
surface liming is indeed an
efficient way to reduce soil
acidity caused by the con
tinued build up of N-fertilizer
in no-tillage programs.
However, it was also
reported that, if the soil is at
a critically low pH level
from the beginning, good
incorporation of lime with
the soil is necessary.
Researchers agree that the
acid-producing charac
teristic of the no-till system
is probably the most serious
sod problem encountered in
the program. However, the
current research in Ken
tucky demonstrates that
surface liming can correct
this acid condition.
Station, 229 Agricultural
Administration Building,
University Park, Pa. 16802.
“Science in Agriculture”
will be available in late May
at county offices of the
Cooperative Extension
Service or from the
Agricultural Mailing Room,
112 Agricultural Ad
ministration Building,
University Park, Pa. 16802.
The Penn State scientist
reported that pullets are
usually free of airsacculitis
until they are moved to
laying houses. Then they
become infected by equip
ment, wild birds, or by the
causal organism in the air.
Although the infection is not
transmitted to humans,
people can carry the
organism on their clothing
and shoes. The infection
spreads slowly and is usually
not detected until the hens
reach peak production.
Farm
Women's
Calendar
Today, May 27
Lancaster Co. Society 4
meeting, at the Barley
home, Washington Boro,
at 1:30 p.m.
Monday, May 29
Memorial Day observed.
Tuesday, May 30
Traditional Memorial Day.
Wednesday, May 31
Lancaster Co. Society 24
meeting, 7:30 p.m.
Program will be on an
tique dolls.
Thursday, June 1
Lancaster Co. Society 17
meeting, hostess Gladys
Sprout. Program will be
an auction of food and
crafts.
Lancaster Co. Society 20
meeting, 1 p.m.
Saturday, June 3
Lancaster Co. Society 1
meeting, program sheep
and their uses.
Lancaster Co. Society 6
meeting, at noon. The
group plans to eat out in
Hershey.
Lancaster Co. Society 10 will
entertain Society 30.
61