Optimum broiler development

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3. Brooding 3.1. Ventilation Pressure scale complete ● Calculations done at 1.2 kg per cubic meter of air density. House width - Pascal’s Air speed Distance travel before meters (feet) (inches of water) m/second (feet/minute) air drop - meters (feet) 10 (32.81) 8 (0.03) 3.50 (688.98) 5.00 (16.40) 12 (39.37) 10 (0.04) 4.00 (787.40) 6.00 (19.69) 15 (49.21) 17 (0.07) 5.00 (984.25) 7.50 (24.61) 18 (59.06) 26 (0.10) 6.35 (1250.00) 9.00 (29.53) 21 (68.90) 37 (0.15) 7.50 (1476.38) 10.50 (34.45) 24 (78.74) 42 (0.17) 8.00 (1574.80) 12.00 (39.37)
3. Brooding 3.2. Relative humidity Controlling relative humidity ● ● ● ● ● The main aim of controlling relative humidity is maintaining dry friable litter. Wet or capped litter will lead to increased carcass issues such as podo-dermatitis and hock burn and in extreme situations even breast blisters. Carcass downgrades is also used as a measurement of bird welfare. Failure to meet minimum requirements will lead to reduced stocking density that is permitted. Moisture is produced by the heating system, drinking system and the birds. To control relative humidity the only option is to increase the air temperature - approximately for every 1°C (1.8°F) we heat the air the relative humidity of the air is reduced by 5%. ● ● Warm air is lighter than cold air and the warmest air in the building is closest to the ceiling. The longer we can keep the outside cold air close to the ceiling the better the opportunity of increasing the temperature of that air and therefore reducing its relative humidity. ● The lower the relative humidity of the air at any temperature the larger the potential of that air to carry (soak up) moisture from the environment. ● 70 - 75% of the water consumed by the bird will be excreted to the air or the litter. It is the job of the ventilation system to remove and prevent a moisture build up in the house.
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Page 29: L-7011-03-EN November 19, 2015

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