Judul: Persentase Karkas, Dada, Paha Dan Lemak Abdomen Itik Alabio Jantan Umur 10 Minggu yang Diberi Tepung Daun Beluntas, Vitamin C Dan E dalam Pakan
Abstrak: Duck meat is potential as protein source, but the off-odor of it restricted the consumption of this meat. Antioxidant could decrease the odor, but the effect of it on the influence of the percentage of carcass, breast, thigh and abdominal fat must be evaluated. Beluntas leaves, vitamin C and vitamin E can be used as antioxidant. The objective of this research was to know the effect feeding beluntas leaf meal, combination of beluntas leaf meal + vitamin C, an the combination of beluntas leaf meal + vitamin E addition on carcass percentage, breast, thigh and abdominal fat. This research used 96 alabio ducks. The ducks were reared from DOD up to 10 weeks. The diet treatments were control diet (K); comercial diet + beluntas leaf meal 0.5% (KB); comercial diet + beluntas leaf meal 0.5% + vitamins C 250 mg/kg (KBC); comercial diet + beluntas leaf meal 0.5% + vitamin E 400 IU (KBE). The data were analysed using ANOVA (Analysis of Variance), and any significant diferrence was further analysed using Duncan Multiple Range Test. The results showed that feeding beluntas leaf meal 0.5%, beluntas leaf meal 0.5 % and vitamin C 250 mg, and beluntas leaf meal 0.5% and 400 IU did not affect the carcass percentage, breast, thigh and abdominal fat of male alabio duck.
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Judul: Pengurangan Off-Odor Daging Itik Alabio Jantan Umur 10 Minggu dengan Pemberian Daun Beluntas, Vitamin C dan E dalam Pakan
Abstrak: Duck is one of poultry commodities as source of animal protein for the human, however the duck’s meat off-odor limits the consumers preferency. The objective of this research was to observe the effect of feeding beluntas leaf powder, combination beluntas leaf powder with vitamin C and combination beluntas leaf powder with vitamin E in reducing off-odor of the Alabio duck meat. This research was conducted on May until September 2010 at the Laboratory of poultry production, Faculty of Animal Science, Bogor Agricultural University. The duck’s meat of 10 weeks age were used in this study. The duck were reared from DOD up to 10 weeks old. The diet treatments were commercial diet as control (K); commercial feed + 0.5% beluntas leaf meal (KB), commercial feed + 0.5% beluntas leaf meal + vitamin C 250 mg/kg (KBC), commercial feed + 0.5% beluntas leaf meal + vitamin E 400 IU/kg (KBE). The parameters observed were off-odor intensity and preference test of thigh and breast meat of male alabio duck. The data were analyzed with analyses of variance (ANOVA) with the method of GLM (Generalized Linear Model) and using SPSS program for windows version 17. If there were any significant differences, the data were further analyzed using Duncan multiple range test. The results shows that feeding of 0.5% beluntas leaf meal (KB) reduced off-odor intensity of thigh meat (3.5%) and breast meat (1.9%). Feeding of 0.5% beluntas leaf meal + vitamin C 250 mg (KBC) increased off-odor intensity of thigh meat (2.3%) and breast meat (5.3%). Feeding beluntas leaf meal of 0.5% + vitamin E 400 IU (KBE) reduce off-odor intensity of thigh meat (11.2%) and breast meat (10.6%). Conclusion of this research was that feeding beluntas leaf meal of 0.5% + vitamin E 400 IU (KBE) was the best treatment in reducing the intensity off-odor of duck meat (thigh, breast), and this meat was most prefered by the panelists compared other treatments.
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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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