Poultry USA - June 2019 - 26

26 ❙ WATTPoultryUSA

4 keys to
cooling broilers
using tunnel
ventilation
Growers can reduce heat stress
on their birds, and get greater
performance, by following these
basic principles.
AUSTIN ALONZO

K

eeping broiler birds cool using tunnel ventilation depends on proper management of three
factors: humidity, temperature and air flow.
Dennis Brothers, a poultry housing extension specialist
with Auburn University's National Poultry Technology
Center and Department of Agricultural Economics and
Rural Sociology, spoke about how growers can best
manage hot conditions on March 14 as part of the 2019
Midwest Poultry Federation Convention in Minneapolis.
He established four keys for protecting birds from heat
stress and providing an optimum growing environment.

1

Use enough fan power

The key to tunnel ventilation - a set up for
broiler houses where air is pulled into the
house at one end by tunnel ventilation fans at
the opposite end - is creating enough air movement to
cool the birds.
Brothers said the system only works if a sufficient volume of air is moved to remove heat from the
birds. As they eat and grow, birds produce increasing
amounts of heat. To cool them, growers must provide a
great enough volume of airflow to sufficiently remove
the heat and create a wind chill effect.

Simply, the movement of air removes heat generated by the bird's body. A greater volume of air
flow creates a lower effective temperature and the bird
feels more cooled. Wind chill effect is not an exact
science, however, as it depends on factors like the
amount and size of the fans, the capacity and design of
the house, and air temperature.
Furthermore, wind chill effect and the ventilation needs of birds depend upon their age and size.
Generally, younger birds prefer warmer temperatures
because they are smaller with less feather coverage. As
they age, their bodies grow, become more feathered
and generate more heat. Because of this, younger birds
feel wind chill more than older birds.
Brothers set a rough set of rules of thumb for
growers to follow, assuming the design is a typical
40-foot-by-500-foot house using 48-inch diameter fans:
■ Young birds feel approximately 2.5
degrees Fahrenheit (1.39 degrees Celsius) temperature wind chill per fan used.
■ Four-week old birds feel approximately 1.5 F (0.8 C)
wind chill per fan.
■ Birds greater than six weeks old feel approximately
1 F (0.5 C) wind chill per fan.
www.WATTAgNet.com ❙ June 2019


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Poultry USA - June 2019

Table of Contents for the Digital Edition of Poultry USA - June 2019

Poultry USA - June 2019
Contents
African swine fever could change everything
ASF sparks uncertainty in the global meat industry
What the US poultry industry needs to know about ASF
How chicken will succeed in the digitized proteins market
Startup organic poultry producer off to fast start
4 keys to cooling broilers using tunnel ventilation
Evaluating early feeding for broilers is complicated
US chicken trade faces challenges and opportunities
Mexico’s poultry industry grows facing uncertainty
Product Review
Market Place
Ad Index
Poultry USA - June 2019 - CT1
Poultry USA - June 2019 - CT2
Poultry USA - June 2019 - Poultry USA - June 2019
Poultry USA - June 2019 - Cover2
Poultry USA - June 2019 - CT3
Poultry USA - June 2019 - CT4
Poultry USA - June 2019 - Contents
Poultry USA - June 2019 - ASF sparks uncertainty in the global meat industry
Poultry USA - June 2019 - 3
Poultry USA - June 2019 - 4
Poultry USA - June 2019 - 5
Poultry USA - June 2019 - 6
Poultry USA - June 2019 - 7
Poultry USA - June 2019 - 8
Poultry USA - June 2019 - 9
Poultry USA - June 2019 - What the US poultry industry needs to know about ASF
Poultry USA - June 2019 - 11
Poultry USA - June 2019 - 12
Poultry USA - June 2019 - 13
Poultry USA - June 2019 - 14
Poultry USA - June 2019 - 15
Poultry USA - June 2019 - How chicken will succeed in the digitized proteins market
Poultry USA - June 2019 - CT5
Poultry USA - June 2019 - CT6
Poultry USA - June 2019 - 17
Poultry USA - June 2019 - Startup organic poultry producer off to fast start
Poultry USA - June 2019 - 19
Poultry USA - June 2019 - 20
Poultry USA - June 2019 - 21
Poultry USA - June 2019 - 22
Poultry USA - June 2019 - 23
Poultry USA - June 2019 - 24
Poultry USA - June 2019 - 25
Poultry USA - June 2019 - 4 keys to cooling broilers using tunnel ventilation
Poultry USA - June 2019 - 27
Poultry USA - June 2019 - 28
Poultry USA - June 2019 - 29
Poultry USA - June 2019 - Evaluating early feeding for broilers is complicated
Poultry USA - June 2019 - 31
Poultry USA - June 2019 - US chicken trade faces challenges and opportunities
Poultry USA - June 2019 - 33
Poultry USA - June 2019 - 34
Poultry USA - June 2019 - 35
Poultry USA - June 2019 - Mexico’s poultry industry grows facing uncertainty
Poultry USA - June 2019 - 37
Poultry USA - June 2019 - 38
Poultry USA - June 2019 - 39
Poultry USA - June 2019 - 40
Poultry USA - June 2019 - 41
Poultry USA - June 2019 - 42
Poultry USA - June 2019 - 43
Poultry USA - June 2019 - 44
Poultry USA - June 2019 - 45
Poultry USA - June 2019 - Product Review
Poultry USA - June 2019 - Market Place
Poultry USA - June 2019 - Ad Index
Poultry USA - June 2019 - Cover3
Poultry USA - June 2019 - Cover4
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