The Rural Voice, 2005-12, Page 36FARM & INDUSTRIAL BUILDINGS
Designed with the farming industry in mind.
Ideally suited for poultry and shop buildings.
Industrial heaters from 40,000 - 175,000 BTU.
Residential garage heaters 20,000 - 50,000 BTU J
now available.
Mid West Infra -Red Mfg. Ltd.
R.R. 1, Wroxeter, Ont. NOG 2X0
519-335-3583 FAX 335-3580
Friendly
wishes for a
Merry
Christmas
and a
Joyous New
Year
from the
Directors,
Management
and Staff.
McKILLOP
MUTUAL
INSURANCE
COMPANY
Established 1876
91 Main St. S. Seaforth
Phone 527-0400
1-800-463-9204
32 THE RURAL VOICE
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Nave a
Wandel6 f ut
Notida�i Seaoo t
Pulin
Elma Steel
and Equipment Ltd.
"Your Great Steel Place"
✓ Large selection of inventory
✓ Scheduled delivery to central
southwestern Ontario
✓ Experienced, professional
service.
2 CONVENIENT LOCATIONS'
Listowel
515 Tremaine Ave. S.
1.800-669-2931
OR 519-291-1388
FAX 519-291-1102
Owen Sound
2275 - 18th Ave. E.
1-800-567-7412
OR 519-371-8111
FAX 519-371-6011
FOR YOUR
STEEL
REQUIREMENTS
0
6
feed four hours after eating. As a
result, he said, if you raise the
feeders at 6 a.m., the birds will be
producing the most heat at 10 a.m.,
before the outside temperature rises.
If you don't raise the feeders until 10
or you leave feed available in the
feeders until that time, even if they're
shut off, the birds will produce their
maximum body heat at 2 p.m. during
the hottest time of the day.
Huffman dealt with the body heat
issue as well, pointing out that while
each bird may not release much heat
on its own (from 28 BTU for a 1.7 kg
broiler to 55 BTU for a 3.5 kg
broiler and 120 for an 8 kg turkey),
the accumulated heat of 10,000 to
12,000 birds adds up to 400,000
BTUs, the equivalent of running
heaters full time, day in, day out,
during the brooding period.
Birds have three ways of getting
rid of their body heat. They
can conduct heat through
contact with a cooler surface, but in a
hot barn the litter is not likely going
to be cool. They can radiate heat
from a hot to a cool surface and they
can excrete hot urine and feces. But
the most effective way of losing heat
is convection, from air moving over
the body and this is where ventilation
plays a big part.
The goal of ventilation systems
should be to try to keep the barn
temperature within two degree C of
the outside temperature in the shade,
Huffman said. There should never be
less than one complete air change per
minute in the barn (1.5 to 2 for caged
birds). The speed of the air moving
over the birds should be 700 feet per
minute over a 1.7 kg bird, ranging up
to 10 CFM for a 3.5 kg. bird. The
wind chill effect increases
dramatically as the speed of the air
passing around the birds increases.
Producers can help remove heat
stress by making sure the air is
travelling over the birds by using
such modifidations as an air deflector
board which steers the air from
ventilation fans down onto the birds.
For barns with cross ventilation
adding a double side air inlet on one
side of the barn, perhaps a separate
air inlet near the bottom of the wall
helps.
Many modern barns are turning to
tunnel ventilation, large fans on the
ends of the barn. The minimum air
li