Judul: Pengaruh Suplementasi Berbagai Antioksidan Terhadap Performa dan Status Fisiologis Ayam Broiler yang Diberi Cekaman Terhadap Lingkungan Temperatur Tinggi
Abstrak: High ambient temperature results in heat stress on broiler chickens. Antioxidant is the most efficient suplement, which alleviate the negative effects of heat stress. This study was conducted to determine the effects of antioxidants suplementation on performance and physiological status of broiler chickens exposed to high environmental temperature. Ten days-old 48 broilers were randomly assigned to a 2x3 factorial design to 3 environmental treatments, 2 experimental diets of 8 replication of one birds each. The chickens were fed a commercial diet with or without mixed antioxidants. The environmental treatments were as follows: constant temperature at 25 ˚C, cyclic temperature at 25-35-25 ˚C, and constant temperature at 32 ˚C. Chickens in high environmental temperature had lower (P<0.01) feed intake, body weight, and body weight gain than in normal temperature. Antioxidants suplementation had no effect on performances and physiological. Antioxidants suplementation increased yellowness (P<0.05) of breast muscle. Antioxidants and environmental treatments did not influence malondialdehyde (MDA) level. These results suggested that antioxidants did not alleviate the negative effect of heat stress on broiler chickens.
Keyword: heat stress, broiler, antioxidants

Judul: The Influence of Supplementation Antanan (Centella asiatica (L.)Urban) and Feather Meal in Diets to Performance of Chicken Broiler Experiencing of High Ambient Temperature.
Abstrak: This experiment was conducted to study the influence of antanan (Centella Asiatica (L.) Urban) and feather meal in diet on performance of broiler exposed to high ambient temperature. This research was run on August to September 2002 in climatic chamber (temperature range from 27.73 to 31.84°C), Biochemical, Physiology and Microbiological Nutrition Laboratory by using 81 chicken broiler strain Avian from age of two weeks and reared for four weeks. Experimental diets were formulated iso-nitrogen and iso-calori containing crude protein 21% and metabolizable energy 3200 KcaUkg. This experiment used Complete Randomized Design (RAL) with two Factorial Pattern of 3 x 3 with three replications. Each of replication consisted of three chickens. Antanan as first factor (factor A) consisted of three levels i.e.: 0%, 5% and 10% and feather meal as second factor (factor B) consisted of three levels i.e.: 0%; 4.8% and 9.6%. Data obtained were analyzed using ANOVA (Analysis of Variance). When the results were significant, the data analyzed continued using Test of Contrast of Orthogonal to see the difference among the treatments. Parameters measured were Feed intake, body weight gain, feed conversion ratio (FCR), mortality and income over feed and chick cost (IOFCC). The results showed that there is no interaction between antanan and feather meal on consumption of diets and accretion of body weight gain of chicken under heat stress, whereas conversion of diets showed a significant interaction (P<0.05). The use of antanan up to 10% and feather meal up to 4.8% in the diet did not have any effect on consumption and accretion ofhody weight gain. In contrast, The use of feather meal up to 9.6% significantly (P<0.01) decreased feed consumption and accretion ofhody weight gain. The use of 5% antanan and 4.8% feather meal in the ration resulted in the best response in term of economic value. Keyword: high ambient temperature, performance, antanan, feather meal.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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