Judul: Penurunan off-odor daging itik Cihateup jantan umur 10 minggu dengan pemberian daun beluntas, vitamin C dan E dalam pakan
Abstrak: Duck is one of a waterfowl which is potential as egg and meat producer. Duck meat has fishy odor (off-odor) and limited the consumers preference. The main objective of this research was to investigate the effect of antioxidants to reduce off-odor of duck meat. This research was conducted at the Faculty of Animal Science, Bogor Agricultural University. The cihateup male duck meat of age 10 weeks were evaluated in this experiment. The duck were raised from 1 weeks up to 10 weeks. The treatments were commercial diet as control (K); commercial feed + beluntas leaf meal 0.5% (KB); commercial feed + beluntas leaf meal 0.5% + vitamins C 250 mg/kg (KBC); commercial feed + beluntas leaf meal 0.5% + vitamins E 400 IU (KBE). The parameters observed were decreasing off-odor of cihateup s meat duck (breast, thigh) and level of consumer preference of cihateup s meat duck. The data were analyzed using ANOVA (Analysis of Variance), and significant diferrences was analyzded using Range Multiple Duncan Test. The results showed that feeding beluntas leaf meal 0.5% (KB) decreased thigh meat off-odor 12.6% and breast meat 7.1%. The results showed that feeding beluntas leaf meal 0.5% + vitamins C 250 mg/kg (KBC) decreased thigh meat off-odor 2.6% and breast meat 0.2%. The results showed that feeding beluntas leaf meal 0.5% + vitamins E 400 IU (KBE) decreased thigh meat off-odor 16.2% and breast meat 12%. The conclusion of this research was that feeding beluntas leaf meal 0.5% + vitamins E 400 IU resulted the lowest intensity of duck meat (breast, thigh) off-odor. Through sensory test this meat was must prefered by panelists.
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Judul: Performa itik Cihateup jantan umur 10 minggu yang diberi tepung daun beluntas, vitamin C dan vitamin E dalam ransum
Abstrak: Male duck is potential as meat producer, but the ducks meat off-odor limited the consumers preference. Reducing off-odor has success with supplementation beluntas 1% in feed. However the feed conversion were higher than control. To improve feed conversion, using beluntas reduced 0,5%. To covered deficient antioxidant, try added vitamin C and E.The purpose of this research was to study the effect of feeding beluntas leaf meal, vitamin C and vitamin E in improving ducks performances (feed intake, body weight, body weight gain and feed conversion). The diet treatments were commercial diet as control (K), commercial diet+beluntas leaf meal 0.5% (KB), commercial diet+beluntas leaf meal 0.5%+250 mg C vitamin (KBC), commercial diet+beluntas meal 0,5%+400 IU E vitamin (KBE). Ninety six ducks were used for this research and divided into four treatments and three replications. The ducks were reared from one week up to 10 weeks of old. The parameter measured were feed intake, body weight, body weight gain and feed conversion. The results showed that feed intake did not affect. While final body weight and body weight gain of duck feeding beluntas leaf meal 0.5%+vitamin E 400 IU highest obtainable was the best feed conversion.
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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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