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 Absorpsi dan Profil Mineral Darah Domba Kembar Lepas Sapih yang Mendapat Kobalt dan Bakteri Rumen Selama Prasapih.
Abstrak: The transition period at post-weaning is a crucial period; the microbial rumen of lamb is not developed yet, milk diet has been removed and the feeding regime is changed. However, growth performance and rumen bacteria in preweaning period affects the growth and nutrient utilization of weaned lamb. The study was designed to evaluate the performance, the absorption and the blood mineral profile (Ca, P, and Mg) in post-weaning lamb offered Co and rumen bacteria consortium previously in the pre-weaning period. Three-four months old of 8 garut sheep with initial body of 9.86±2.02 kg were divided into two treatments groups of control and the post administration of rumen bacteria consortium (CoBac) groups. Results showed that administration of Co and rumen bacteria consortium during pre-weaning period had no effect on performance, mineral absorption and blood mineral profile in post-weaning. It is concluded that administration of Co and rumen bacteria consortium during pre-weaning period of lamb did not improve the performance and nutrient utilization during transition period.
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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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