Judul: Performa, absorpsi dan profil mineral darah domba kembar lepas sapih yang mendapat kobalt dan bakteri rumen selama prasapih
Abstrak: Periode transisi pasca sapih merupakan periode kritis; mikroba rumen anak domba belum berkembang, pemberian susu dihentikan dan pemberian pakan diubah dari pakan yang mudah dicerna ke pakan yang sulit dicerna. Namun performa anak domba dan perkembangan bakteri rumennya selama prasapih dapat mempengaruhi utilisasi nutrien dan performanya pada periode transisi lepas sapih. Penelitian ini bertujuan untuk mengevaluasi performa, absorpsi dan profil mineral di darah (Ca, P, dan Mg) pada anak domba lepas sapih yang diberi Co dan konsorsium bakteri rumen selama periode prasapih. Sebanyak 8 ekor domba garut umur 3-4 bulan dengan kisaran bobot badan 9.86±2.02 kg digunakan dalam penelitian yang sudah dibagi ke dalam dua perlakuan yaitu kontrol dan pasca pemberian konsorsium bakteri rumen selama periode prasapih (CoBac) dan dikelompokkan menjadi empat kelompok berdasarkan bobot badan. Hasil menunjukkan bahwa pemberian Co dan konsorsium bakteri rumen selama periode prasapih belum dapat mempengaruhi performa, absorpsi mineral dan profil mineral darah domba saat lepas sapih.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Absorption, Blood, Co+rumen bacteria, Mineral, Performance

Judul: Performa Domba Kembar Lepas Sapih yang Mendapat Kobalt dan Konsorsium Bakteri Rumen selama Periode Prasapih
Abstrak: In the period of weaning, twin born lambs with low birth weight are more susceptible to environmental temperature and pathogenic infection. This study was design to evaluate the performance of weaned twin lambs offered diet supplemented with Co and rumen bacteria consortium during pre-weaning period. Eight of three months-old of twin garut lambs were selected for this study. Data were analyzed according to t-test student. Treatments consisted of: 1). Control diet and 2) diets supplemented with Co + rumen bacteria consortium (CoBac) during pre-weaning period. Result showed that as feed and dry matter intake of post-weaning twin lambs significant (P<0.01) to gain with equation was y = -583.4 + 92.83x; r2 = 0.77 and y = -244.5 + 47.85x; r² = 0.67. The gain (P<0.01) accord with age of post-weaning twin lambs with y = 0.056x + 5.788; r² = 0.352. There were no significant in nutrient intake, digested nutrient and average daily gain of post-weaning twin lambs. Supplemented Co + rumen bacteria consortium could not improved performance of post-weaning twin garut lambs.
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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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