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20253035404550 25 75 50 100 0 Relative Humidity, % Danger high mortality High stress Moderate stress ComfortCool Temperature, ° C Figure 1. Effect of Temperature.

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Presentation on theme: "20253035404550 25 75 50 100 0 Relative Humidity, % Danger high mortality High stress Moderate stress ComfortCool Temperature, ° C Figure 1. Effect of Temperature."— Presentation transcript:

1 20253035404550 25 75 50 100 0 Relative Humidity, % Danger high mortality High stress Moderate stress ComfortCool Temperature, ° C Figure 1. Effect of Temperature and Humidity on Poultry Heat Stress

2 Radiant heat Energy in feed Water intake (temperature important) Excreta heat and energy (loss of bicarbonate and potassium Growth Activity Convection and radiant heat Metabolic heat Figure 2. Energy and Heat Flow in Poultry Evaporation heat loss from respiration Conduction heat loss to litter and concrete

3 0 1 2 3 4 5 6 100120140160180200220 Hours Respiration Rate (breaths/min) High Mortality High Stress 20 Stress NORMALNORMAL Figure 3. Effect of Respiration Rate and Time on Stress

4 TimeTempRH days°C%FCR Exp 121-4224301.97 21-4223-3830-202.16 Exp 2 32-4622401.96 32-4627-3270-502.57 Figure 4. Effect of Heat Stress on FCR in Broilers

5 Average $53 Average $70.70 Average $88.38 Average $106 Average $124 050100150200 150 200 250 300 350 Exp 1 $66 Exp 2 $182 Exp 1 $56 Exp 1 $47 Exp 1 $38 Exp 1 $28 Exp 2 $78 Exp 2 $104 Exp 2 $130 Exp 2 $156 Savings per 1,000 birds, $ Average Feed cost $/MT Figure 5. Economics of Heat Stress in Broilers Savings, heat stress vs normal temperature at various feed costs

6 12 m max 2.75 m 1.75 m 3 m min 35 °min insulation concrete floor White or reflective roof bird mesh drain N N S S E E W W Figure 6. Open Broiler House with Concrete Floor bird mesh and roll down plastic curtains grass

7 12 m max 2.75 m 1.75 m 3 m min 35 °min insulation bamboo or wood slat floor with 2.5 cm solid and 1 cm open white or reflective roof bird mesh drain N N S S E E W W Figure 7. Open Broiler House with Slat Floors bird mesh and roll down plastic curtains sloping earth cement footings treated timber supports metal rat guards stairs or ramp gap to prevent rat entry 1.75 m


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