Browsing by Author "Amarasekara, A.M.R.S."

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    Observation of Enviorenmental Factors and Live Performance in Enviorenmental Control Broiler Houses During Hot Weather
    (Uva Wellassa University of Sri Lanka, 2010) Amarasekara, A.M.R.S.
    Broiler building typology associated with the local characteristics (climate, topography and surrounding vegetation) and handling systems (stocking density, curtains, equipment and nutrition) influence the inside environment. This study is mainly focused to analysis the main environmental factors which effect to live performance of Broilers in hot weather. Under a less stressful environment, animals can utilize more feed efficiently. But Heat stress is a major concern of the broiler industry due to the resulting decreased growth, feed intake and increased FCR ratio and mortality. Heat exposed bird's decrease feed intake in order to reduce metabolic heat production and resulting in slower growth. Heat is added to the air of a building by the body heat production, heat from electric lights and motors, sometimes heat from the roof and walls, and heat from fermentation of the litter or accumulated droppings. Of these, the dominant source of heat is body heat. Maintaining proper temperature to promote efficient growth is a key to profitable Broiler production. In this study Broilers in three broiler hoses were used by giving same environmental conditions for them. Then temperature and relative humidity of broiler house, mortality, and panting and water intake were measured. According to the results shows significantly (p<0.05) that water intake and relative humidity are the factors that cause for the Broiler's weight gain. Because of that have to provide adequate ventilation and stimulating water consumption is essential. It will help to decrease the heat generation from the metabolic activities. In addition to heat-stress mortality, economic losses associated with broiler heat stress also occur as a result of lowered growth rate and decreased feed efficiency. Therefore, it is natural for proaucers want to stimulate feed consumption in hot weather. Any management technique which promotes feed consumption or increased activity during the peak hot periods may be counter-productive. The extra feed consumed will increase the bird's heat load and probably result in additional mortality. Key words: Broiler, Hot weather, Relative humidity, live performances
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    Observations on Environmental factors and Live Perfomances of Broilers in Environment Controlled Broiler Houses during Hot Weather
    (Uva Wellassa University of Sri Lanka, 2010) Amarasekara, A.M.R.S.; Nambapana, N.M.N.; Jayasena, D.K.D.D.; Ganegoda, G.A.P.
    Heat stress is a major concern of the broiler industry as it causes decrease in growth, reduced feed intake and increased FCR ratio and mortality. Heat exposed bird's decrease feed intake in order to reduce metabolic heat production and resulting in slower growth. Maintaining proper temperature to promote efficient growth is a key to profitable broiler production. This study focused on analyzing the main environmental factors that affect the behavior of broilers in hot weather. In this study broilers were kept in three broiler houses which had the same environmental conditions. The temperature and relative humidity of broiler house, mortality, and water intake of birds were measured during a period of three months. According to the results water intake and relative humidity are the factors that significantly affect (P<0.05) the weight gain of broilers. In addition to heat-stress mortality, economic losses associated with broiler heat stress also occur as a result of lowered growth rate and decreased feed consumption efficiency. Any management technique which promotes feed consumption or increased activity during the peak hot periods may be counter-productive in a broiler house. The extra feed consumed will increase the bird's heat load and probably result in additional mortality. The study indicates that controlling heat inside broiler units during hot weather is important to increase the broiler productivity Key words: Broiler, Hot weather, Relative humidity, Live performances