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: 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: 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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