Choosing The Right Ventilation System For Your Poultry House
Farmer's Weekly|June 15, 2018

In this final article of a three-part series on the basic principles of chicken housing, independent poultry consultant Jan Grobbelaar discusses natural and environmentally controlled ventilation.

Choosing The Right Ventilation System For Your Poultry House

Two ventilation systems are used in egg and boiler production: natural ventilation (opensided houses), and mechanical ventilation (environmentally controlled houses).

The main difference is the way in which the environment is controlled. In a naturally ventilated house, the inside environment is controlled using natural wind and airflow; in a mechanically ventilated house, electric fans are employed.

NATURAL VENTILATION

In a naturally ventilated poultry house, the key is to maximise the wind; the building should therefore be constructed so that it uses the natural wind to create airflow. This means it should be oriented so that the open sides face the direction of the prevailing wind. The precise angle is not that critical, as effective ventilation occurs up to 30° either side of the wind direction.

(The house should also be as close as possible to an east-west direction lengthwise to minimise direct sunlight into the house.)

Natural ventilation in a building can be created by means of two actions: the stack effect and the wind force (pressure) effect. The ventilation requirements for a naturally ventilated building are expressed in terms of the fresh air exchange rate, which indicates the number of times the volume of air in the building is replaced (volume = wall height x building width x building length). The ventilation system must replace this interior air with fresh air over a specified period. Irrespective of the outside temperature and age of the chickens, ventilation must be sufficient to ensure there is no build-up of stale air in the house.

THE STACK EFFECT

Bu hikaye Farmer's Weekly dergisinin June 15, 2018 sayısından alınmıştır.

Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.

Bu hikaye Farmer's Weekly dergisinin June 15, 2018 sayısından alınmıştır.

Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.

FARMER'S WEEKLY DERGISINDEN DAHA FAZLA HIKAYETümünü görüntüle
New farmers' seedling pitfalls
Farmer's Weekly

New farmers' seedling pitfalls

Inexperienced farmers may be tempted to grow seedlings from seed themselves, but they have much to gain by trusting a seedling grower at a nursery to perform this task for them instead

time-read
2 dak  |
Farmer's Weekly 27 December 2024
South African avocado production: a success story
Farmer's Weekly

South African avocado production: a success story

Avocado production in South Africa has expanded markedly since the industry's humble beginnings over 80 years ago. From a small grove planted in 1938 in what was then Nelspruit, the industry has blossomed to seven million trees planted on 20 000ha. Dr Guy Witney, project manager at Great Brak Avos, spoke to Annelie Coleman about the country's avocado production.

time-read
6 dak  |
Farmer's Weekly 27 December 2024
Unlocking value through livestock exports
Farmer's Weekly

Unlocking value through livestock exports

Exporting livestock might sound like a daunting business that's better left for big companies, but Gerrie Ferreira, who farms near Oudtshoorn in the Western Cape, has been doing it successfully for almost 30 years, sometimes in partnership with other breeders. He spoke to Glenneis Kriel about the huge potential this market holds, and offers some advice for farmers who are contemplating going this route.

time-read
7 dak  |
Farmer's Weekly 27 December 2024
An agribusiness's dedication to community upliftment
Farmer's Weekly

An agribusiness's dedication to community upliftment

For agribusiness NWK, located in Lichtenburg, North West, corporate social investment is an important part of creating a positive influence alongside financial returns. Johan Bezuidenhout, NWK’s group manager of corporate marketing and communication, spoke to Annelie Coleman about why the company chooses to invest millions of rands in the area it operates in every year.

time-read
5 dak  |
Farmer's Weekly 27 December 2024
Empowering dreams, transforming lives
Farmer's Weekly

Empowering dreams, transforming lives

Since its launch in 2013, the Agri's Got Talent competition has revolutionised the lives of many farmworkers by unlocking their hidden talents and fostering a culture of empowerment. Glenneis Kriel spoke to various finalists about how the contest has changed their lives.

time-read
7 dak  |
Farmer's Weekly 27 December 2024
Foreign investment: agriculture maintains its appeal
Farmer's Weekly

Foreign investment: agriculture maintains its appeal

South Africa remains a popular destination for foreign investors, despite an often negative outlook from its citizens. It is a gateway to Africa, and with its counterseasonal production to the Northern Hemisphere and favourable weather, local agriculture is especially well placed to attract foreign interest, bringing with it hope for rural communities

time-read
5 dak  |
Farmer's Weekly 27 December 2024
The real value and message of COP29 for SA agriculture
Farmer's Weekly

The real value and message of COP29 for SA agriculture

While the 2024 Conference of the Parties may have disappointed those who hoped for real progress, it's more important for South African agriculture to highlight its role in carbon mitigation

time-read
3 dak  |
Farmer's Weekly 27 December 2024
Improving efficiencies in feed and grain milling
Farmer's Weekly

Improving efficiencies in feed and grain milling

Bühler, a Swiss-based company that provides solutions and equipment for various industries, including food and animal feed processing, has pledged that by 2025, it will deliver scalable solutions that will reduce energy, waste and water by 50% in the value chains of its customers.

time-read
2 dak  |
Farmer's Weekly 27 December 2024
Tips for better olive production
Farmer's Weekly

Tips for better olive production

At an SA Olive Association field day in November, industry experts shared ways to improve olive production efficiencies, from soil preparation to harvesting.

time-read
3 dak  |
Farmer's Weekly 27 December 2024
More effort needed to protect vulnerable cheetah
Farmer's Weekly

More effort needed to protect vulnerable cheetah

On International Cheetah Day, commemorated every year on 4 December, emphasis was placed on the vulnerability of the species.

time-read
1 min  |
Farmer's Weekly 27 December 2024