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reading assignment 6

reading assignment 6 - possible during the evening hours 1...

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Dr. Emmert POSC 1023 10 October 2006 Reading Assignment VI 1. Heat stress begins for adult birds when the air temperature reaches 80 degrees and is apparent when the temperature rises above 85 degrees. 1. The four methods birds use to dissipate heat are radiation, conduction, convention, and evaporation. 2. Sensible heat loss is most effective when the temperature is less than 77 degrees, before heat loss switches to evaporative heat loss. 1. Panting removes heat by evaporating the water from the lining of the respiratory tract. 2. Respiratory alkalosis causes the kidneys to excrete excessive amounts of electrolytes. The shift in pH decreases feed intake and adversely affects growth. 1. The three techniques that increase nutrient intake during heat stress are increasing the nutrient density of rations, feeding the birds when consumption is highest—right after the lights come on and one hour before they turn off, and lastly cool the birds as much as
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Unformatted text preview: possible during the evening hours. 1. Electrolytes can be added to the water during high temperature to replace the losses and to stimulate water consumption. 2. The roof can be changed to a shiny surface that reflects heat, cleaned to avoid rust and dirt, and painted it with a metallic zinc coat. 1. Foggers inject fine water particles into the warm air within a house. As the water vaporizes it absorbs heat from the air, thereby lowering the temperature. 2. Dead airspaces can be avoided by using forced ventilation, tunnel ventilation, and evaporative cooling with power ventilation to keep the air moving. 3. Tunnel ventilation increases convective heat loss by reducing the temperature the birds’ experience. 4. Evaporative cooling pads operate like foggers except for the fact that the air is cooled when it passes through the wet pads as it enters the house. It ca occur on a continuous basis....
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