Judul: Konsumsi dan Pertumbuhan Kambing Peranakan Etawa Periode Prasapih yang diberi Ransum Strater dengan Cara Bebas Pilih
Abstrak: One of the ways to satisfy the needs of livestock, But befitting with a preferred feed livestock is to use the cafeteria feeding system. The cafeteria feeding give opportunity for animal to choose his favorite feed ingredients. The research worked on two groups of goat kids (6 goat kids) fed a starter ration mix and cafeteria feeding. The observed variables were body weight gain, feed intake, consumption of nutrients, and feed efficiency. This study aims to provide information feedstuffs favored by the kid and get a starter ration composition using the cafeteria feeding system. The results showed a propensity to consume pollard and soybean meal. The cafeteria feeding system generates the following composition of feed ingredients pollard (49.62%), corn (2.41%), soybean meal (20.96%), cassava (23.56%), and coconut meal (3.45%). The performance of the two treatments is cafeteria feeding and mix body weight 10.67 (kg) and 11.177 (kg) and feed efficiency of 0.48 and 0.46.
Keyword: Bogor Agricultural University (IPB), starter fed., etawa breed goat, goat kids, cafeteria feeding, Animal welfare

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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