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Air quality is also managed by varying shed ventilation.

Harvesting, also known as ‘partial depopulation’, ‘thinning out’, or ‘multiple pick-up’, may be done up to four times, depending on need for light or heavy birds.Meat chickens are farmed in large open poultry houses, usually refered to as ‘sheds’, ‘houses’ or barns, but sometines as ‘units’.Shed sizes vary, but a typical new shed is 150 meters long and 15 meters wide and holds about 40,000 adult chickens.On arrival at the broiler farm, day-old chicks are placed onto the floor of the shed, where they are initially confined to an area of between a half to one third of the total shed area (the ‘brooding area’) and given supplementary heating from gas heaters or heat lamps.This is called brooding and the heaters are referred to as brooders.The farmer aims to maintain shed temperatures within this range, although in sheds of large birds towards the end of grow-out, the temperature may be reduced.Shed temperature and humidity can be managed by altering ventilation and using stirring fans and water mists.An increasing number of chicken sheds in Australia have ‘tunnel ventilation’.Tunnel ventilation sheds have fans at one end of the shed which draw air into the shed through cooling pads in the walls, over the chickens and out the fan end of the house at high speed.The chickens have adequate lighting to see by and to find feed and water, with dark periods each day to allow them to rest.The lighting provided is usually dimmer than natural lighting to promote calm.

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