Browsing by Author "Nambapana, N.M.N"

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    Reduction of Stress of Female Broiler Breeders During Growing Period to Maintain the Uniformity Level by Changing Temperature and Stocking density
    (Uva Wellassa University of Srilanka, 2011) Kumara, H.M.W.G.S.L.; Nambapana, N.M.N
    NOTE: see the PDF version Although the birds have high genetic potential for faster growth rate, better feed conversion, and increased meat yield in their progeny, if there is no optimum environment conditions for growth, the genetic potential does not appear in the environment. Among the factor for the better performances and health of the poultry birds, temperature and stocking density are the critical factors for stress of the birds in the poultry houses (Rosales, 1994). Chicken, unlike most other animals, do not possess sweat glands to aid in heat loss. The chicken removes excess body heat by radiation from the skin surface through the air to another object, by conduction to cooler objects with which the bird is in contact (Doug Grieve, 1990). Caged birds are more susceptible to heat stress because they are unable to seek a cooler place and there is less conductive heat loss in cages. As the environmental temperature approaches the body temperature of the bird, 41 °C (106 °F), the efficiency of these heat loss mechanisms diminish. At this point the evaporation of water from the respiratory tract becomes the major heat loss mechanism of the birds (Brake, 1987).The term "stress" is commonly used to describe the detrimental effects of a variety of situations on the health and performance of poultry. After extended or repeated periods of stress, birds become fatigued and weak, so they often succumb to starvation and infectious diseases (Rosales, 1994). Since the past, problems in broiler breeders are caused by combinations of whole house temperature and stocking density. Maintaining a uniform flock during the growing period of the broiler breeders may facilitate higher egg production during breeding period. So the broiler breeder farmers have to pay their attention to maintain over 80% uniform flock with increasing uniformity during both growing and breeding period for maximum production. The present study, aims to find better combination of whole house temperature and stocking density of broiler breeders to maintain over 80% uniform flock with increasing uniformity during growing period.
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    Study on Effect of Supplemental Exogenous Protease Enzyme in diet with Reduced levels Of Soybean Meal on Feed Conversion Ratio of Broilers
    (Uva Wellassa University of Sri Lanka, 2012) Nuwarapaksha, N.M.E; Nambapana, N.M.N
    Feeding enzymes to poulcry is one of the major nutritional advances in the last fifty years (Kfiattak ef at., 2006). The use of enzymes in animal Feed is o£ great importance as using high levels of good vegetable protein sources such as Soybean meal poses certain problems like increased viscosity of gut contents, poor digestibility and poor chick due to its high fiber content (?.5 % CF). SBM is rich in non-starch (NSP) which reduces the digestibility of the SBM. Zanella e/ at. (\ 999) that these effects of NSP can be overcome of with suitable exogenous enzyme acids in a wide range of natural feed ingredients, allowing lower protein diets to be formulated without loss in animal performance. Protease is a protein digesting enzyme that breaks down storage proteins binding starch within feed ingredients. This makes the energy From protein bound starch available to the bird to be used for productive purposes. Proteases are also effective in releasing protein anti-nutrients found in ingredients like soybean meal. This function of proteases makes proteins more available (Panda el at., 1 998]. Protease enzyme improve the digestibility of amino acids in a wide range of natural feed ingredients, allowing lower protein diets to be formulated without loss in animal performance. Not only does such use provide cost savings for the user.