—Lancaster Famine, Saturday, June 30,1979
32
Summer heat control critical
NEWASB? * 'Jy
Summer 'Delxnarva broiler
growers watch fearfully for
that prolonged, extreme
heat wave. When broilers
are exposed to temperatures
above 100 degrees F., some
will die. But when the
temperature soars above 105
degrees F., they die by the
thousands. And in this
catastrophe the so-called
weaker sex proves to be the
stronger-about 90 per cent
of the dead birds will be
cockerels.
Since the cockerels in a
flock on the average will be
one-half pound heavier than
the pullets, and since older
birds are more susceptible to
heat stress than younger
birds, the economic loss is
usually severe.
According to University of
Delaware Extension
agricultural engineer Ernest
W. Walpole, growers with
modern, well-insulated,
mechanically ventilated
broiler houses have the best
chance of surviving a heat
wave with minimum losses.
Insulation resists or slows
down the heat flow into a
building. In doing this, it
stores a lot of heat. The
insulation, the attic, the
whole house becomes quite
warm and stays warm long
into the night. The secret is
to get the house cooled off
before the next day’s heat
returns and also to use the
cooler night air to relieve the
birds even before the house
has cooled off. This is where
the mechanical ventilation
system has no equal.
There are two systems
commonly used in this part
of toe country:
Pans fixca in the side wall,
used with adjustable air
inlets.
WHEAT
WANTED!
EARLY CUT WHEAT
FOR
MANUFACTURING
SNA VELY’S BEST NATURAL
ALL PURPOSE FLOUR
Light Soft & Lively Flour
For Better Baking
Cakes, Pies, Buns & Bread
Milled From Natural Wheat
Nothing Added
No Waiting
Fast Unloading and Drying
Cash on Delivery
SNAVELY’S MILL, INC.
333 Snavely Mill Rd.
Lititz, Pa. 17543 Ph: 717-626-0256
Fans suspended from the
center of the house all
blowing the same direction
down the length of the house.
With the first system
(fixed fans), it is important
to realize that air movement
inside the house is entirely
dependent on the velocity of
the incoming air. Therefore,
one should keep windows or
curtains and doors closed,
forcing all incoming air to
come through the controlled
air inlets. These inlets
sfiould be adjusted to get "an
air velocity of 800 feet per
minute. The air should be
deflected towards the floor
(in Winter it should be
directed across the ceiling).
A person should set the
thermostats of one-third of
the fans, providing around 1
CFM per biro at 70 degrees
F. Early in the morning, the
thermostats of the
remaining fans should be set
at 85 degrees F. The outside
air should warm up faster
than the pen air and a person
wants to keep the pen air
cooler than outside as long
as possible.
Sometime in the af
ternoon, when all fans are
running, one should set the
85-degree F. thermostats
back to 75 degrees F. This
will keep them running most
of the night, or at least until
the house cools down to 75
degrees F. The outside
temperature starts dropping
after 4 p.m., and one wants
to use the cooler evening and
night air to cool the birds and
the house as rapidly as
possible. There is no danger
of chilling the birds or
stressing them with drafts
while the air temperature is
above 75 degrees F., notes
Walpole.
With the second system
OF
(fans in center of house), one
should open all windows or
curtains and end doors. A
person should use 30 to 36
inch diameter fans, set no
more than 40 feet apart. Air
should blow to the north or
east end depending on house
orientation. If there is a heat
wave the wind, if any, will be
from the south to southwest.
One should blow the air with
the wind; not against it.
Early in the morning, all
the fans should be set at 85
degrees F. With an open
house, there is no need to
start the fans before the
birds are uncomfortable.
Then, as with the first
system, one should set the
thermostats back to 75
degrees F. so they will
continue running until the
house has cooled off.
With both systems, one
should provide adequate
attic ventilation, having
continuous ridge ventilators
or unit ventilators providing
one square foot of exhaust
area for each 200 square feet
of floor area. One should
WAIVER
SATES
BIG BUCKS.
I Here’s the deal buy an IH 1440,1460 or 1480 Axial-Flow I
I Combine now, and we’ll waive finance charges* H
I ti yPEa until later in the season Every day you wait can H
I ? 0 tU M'I roake a difference to you because we discount H
■ your interest rate These reliable, low-mamten- H
H ance IH combines help you harvest a higher H
H ■ percentage of your crop— with a lower per- H
■ .. ... centage of damaged or cracked kernels Stop H
I /' vS • in and see us toda Y The sooner you buy, H
■ H
I *IH WAIVER-OF-FINANCE PROGRAM I
■ EQUIPMENT BUY NOW WE LL WAIVE FINANCE I
■ OR UP UNTIL: CHARGES UNTIL; ■
I Combines 8/31/79 9/1/79 I
■ Corn Heads 8/31/79 9/1/79 I
I Headers 8/31/79 9/1/79 I
'When financed through the International Harvester Credit Corporation for at least 12 months
I ||| • This offer also applies to used combines I
I m INTERNATIONAL' taken in trade ■
■ ■ SSS!£HSI!P AL • Rental and lease plans available .. . See I
I I E « UIP * E " T us for details I
I fIMAUf O R.D. 1, MYERSTOWN, PA I
■ SIVVn ft Located 1 MlleS. of Int. 78 S 6 Miles N. ■
I BASHORE, INC. I
I PHONE: 717-933-4138 ■
provide soffit inlets of equal
area to the exhaust ven
tilators on the ridge.
If, in spite of best
management, the pen
temperature gets above 100
degrees F., and birds start
dying, one should spray
water directly on the birds
using a hose with a fine mist
nozzle. A person may end up
with a wet house, says
Walpole, but the birds will
likely stay alive.
REGISTERED
BELGIAN
STUD
SERVICE
Excellent size
& quality.
White Mane
& Tail
Service fee
$4O with
return privilege
EDWIN REIFF
Lancaster Co., PA
717-656-6801
in broiler houses