Judul: Perilaku Makan Kambing Peranakan Etawah Bunting dan Pengaruhnya terhadap Konsumsi, Kecernaan Bahan Kering, serta Bobot Badan.
Abstrak: Goat feeding behavior was an important study in livestock. This study aimed to examine the relationship feeding activity towards consumption, digestibility, and body weight gain in breeding doe Etawah Crossbreeed. This study uses 12 PE doe with an average weight of 40.40 ± 3:19 kg range. This study uses the exploration and correlation analysis. Variables measured were feeding behavior (time spent concentrates, forage consumed within one hour, and a feeding time ) and performance of doe (consumption, digestibility, and body weight gain). Results show the time spent concentrate has a weak relationship with a positive correlation to consumption. Forage consumed within an hour of having a relationship with a weak negative correlation with dry matter digestibility. Feeding time had a weak association with a negative correlation with body weight daily. Feeding behavior was needed in the management of livestock feeding. So that the management could be seen aas feeding their effects on animal performance.
Keyword: consumption, digestibility, etawah crossbreed doe, feeding behavior, body weight gain

Judul: Produktivitas Kambing Peranakan Etawah Jantan dan Betina dengan Pemberian Ransum Grower Komplit Tinggi Energi dan Protein
Abstrak: Etawah goats in growing phase require a complete and balance nutrition for growth and preparation for reproduction phase, especially energy and protein. This research aimed to compare the productivity of Etawah growing kids fed with high energy and proteins complete rations based on NRC (2006). This research used 4 male and 4 female goats at 4 months age with initial body weight of 11.38±3.15 kg and 12.13±2.70 kg, respectively the data were analyzed with TTest with 2 treatments (male and female) and 4 groups. Concentrate and forages ratio was 90% and 10% from total feed. Parameters in this research were dry matter intake, body weight gain, protein efficiency ratio, and feed conversion ratio. Statistical analysis showed that no significant results for dry matter intakes (g day- 1), but body weight gain (g day-1), feed conversion ratio and protein efficiency ratio of male goats was significantly (P<0.05) better than female group. These results indicated that consumption and body weight gain were in line with NRC (2006) recomendation so as to the implementation in Indonesia needs to be further investigated.
Keyword: Bogor Agricultural University (IPB), performance, high energy protein rations, feed conversion, etawah growing kids

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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