Judul: Mineral pada Susu Kambing Peranakan Etawah yang Diberi Ransum Bersuplemen Kedelai Sangrai, Selenium, Kromium, Vitamin A, Ddan E
Abstrak: Milk from Etawah grade goatsis known as an alternative source of animal protein and provides better nutrients than cow’s milk. However,the dairy goat in Indonesia has low productivity. Goat may be exposed to heat stress and therefore nutrient intake is not adequate for optimum milk production. This study was designed to evaluate the efficiency of mineral, roasted soybeans, and vitamin supplementation in lactating goats. Eight Etawah gradegoat were allocated randomly to two dietary treatments. Experimental diet were a complete diet without supplement (treatment 1) and diet supplemented with roasted soybeans (280 g/kg),selenium (0.5 ppm),cromium (3 ppm),vitamin A (8000 IU/kg), vitamin D (1500 IU/kg), dan vitamin E (400 IU/kg). Feed intake, mineralabsorption, andmilkmineral content were observed. The results showed that the suplementation of minerals and vitamins in a complete ration did not affect feed intake, mineral absortion and mineral component in the dairy goats. It was concluded that supplementation of roasted soybeans, selenium, chromium, vitamin A, D and E in lactating goats did not influence absorption and secretion of the mineral in milk of Goats. The improvement of feed quality in feeding Etawah grade goats was important tosupport high production and quality of milk.
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Judul: Manfaat Suplementasi Selenium dan Vitamin E dalam Ransum Ampas Mengkudu Terhadap Produksi Susu dan IOFC Kambing PE Laktasi.
Abstrak: Ampas mengkudu sebagai limbah industri obat berbahan dasar mengkudu masih dapat digunakan sebagai bahan pakan ternak yang memberikan efek peningkatan kesehatan. Penelitian ini bertujuan mengkaji penambahan mineral Se dan vitamin E dalam ransum ampas mengkudu pada kambing peranakan Etawah (PE) guna meningkatkan produksi susu ternak dan efeknya terhadap pendapatan peternak. Rancangan acak kelompok digunakan dengan menggunakan 3 jenis ransum sebagai perlakuan terhadap 9 ekor kambing PE laktasi dengan rataan produksi sebesar 0.5 liter ekor-1 hari-1 sebagai kelompok. Ransum yang digunakan yaitu berupa R0 = 60% rumput odot + 40% konsentrat; R1 = 45% rumput odot + 15% ampas mengkudu + 40% konsentrat; dan R2 = R1+ 0.17 mg Se dan 22.22 mg vitamin E. Peubah yang diukur adalah konsumsi pakan, produksi susu, efisiensi ransum, dan Income Over Feed Cost (IOFC). Hasil menunjukkan tidak adanya pengaruh terhadap konsumsi pakan ternak. Ransum ampas mengkudu yang dikombinasikan dengan mineral Se dan vitamin E memberikan hasil yang cenderung lebih baik pada peubah produksi susu, efisiensi ransum, dan IOFC.
Keyword: ampas mengkudu, selenium, vitamin E

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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